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data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">(Top)</div> </a> </li> <li id="toc-Diver_searches" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Diver_searches"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Diver searches</span> </div> </a> <button aria-controls="toc-Diver_searches-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Diver searches subsection</span> </button> <ul id="toc-Diver_searches-sublist" class="vector-toc-list"> <li id="toc-Search_patterns_controlled_by_ropes_and_lines" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Search_patterns_controlled_by_ropes_and_lines"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Search patterns controlled by ropes and lines</span> </div> </a> <ul id="toc-Search_patterns_controlled_by_ropes_and_lines-sublist" class="vector-toc-list"> <li id="toc-Circular_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Circular_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.1</span> <span>Circular search</span> </div> </a> <ul id="toc-Circular_search-sublist" class="vector-toc-list"> <li id="toc-Procedure" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Procedure"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.1.1</span> <span>Procedure</span> </div> </a> <ul id="toc-Procedure-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Variations_on_the_circular_search" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Variations_on_the_circular_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.1.2</span> <span>Variations on the circular search</span> </div> </a> <ul id="toc-Variations_on_the_circular_search-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Safety" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Safety"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.1.3</span> <span>Safety</span> </div> </a> <ul id="toc-Safety-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Jackstay_searches" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Jackstay_searches"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.2</span> <span>Jackstay searches</span> </div> </a> <ul id="toc-Jackstay_searches-sublist" class="vector-toc-list"> <li id="toc-Procedure_2" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Procedure_2"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.2.1</span> <span>Procedure</span> </div> </a> <ul id="toc-Procedure_2-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Variations_on_the_jackstay_search" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Variations_on_the_jackstay_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.2.2</span> <span>Variations on the jackstay search</span> </div> </a> <ul id="toc-Variations_on_the_jackstay_search-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Safety_2" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Safety_2"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.2.3</span> <span>Safety</span> </div> </a> <ul id="toc-Safety_2-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Snag-line_search" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Snag-line_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.2.4</span> <span>Snag-line search</span> </div> </a> <ul id="toc-Snag-line_search-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Cave_diving_emergency_searches" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Cave_diving_emergency_searches"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Cave diving emergency searches</span> </div> </a> <ul id="toc-Cave_diving_emergency_searches-sublist" class="vector-toc-list"> <li id="toc-Searches_for_lost_guideline" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Searches_for_lost_guideline"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2.1</span> <span>Searches for lost guideline</span> </div> </a> <ul id="toc-Searches_for_lost_guideline-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Lost_buddy_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Lost_buddy_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2.2</span> <span>Lost buddy search</span> </div> </a> <ul id="toc-Lost_buddy_search-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Search_patterns_controlled_by_compass_directions" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Search_patterns_controlled_by_compass_directions"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>Search patterns controlled by compass directions</span> </div> </a> <ul id="toc-Search_patterns_controlled_by_compass_directions-sublist" class="vector-toc-list"> <li id="toc-Spiral_box_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Spiral_box_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3.1</span> <span>Spiral box search</span> </div> </a> <ul id="toc-Spiral_box_search-sublist" class="vector-toc-list"> <li id="toc-Procedure_3" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Procedure_3"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3.1.1</span> <span>Procedure</span> </div> </a> <ul id="toc-Procedure_3-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Applications" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Applications"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3.1.2</span> <span>Applications</span> </div> </a> <ul id="toc-Applications-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Compass_grid_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Compass_grid_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3.2</span> <span>Compass grid search</span> </div> </a> <ul id="toc-Compass_grid_search-sublist" class="vector-toc-list"> <li id="toc-Procedure_4" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Procedure_4"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3.2.1</span> <span>Procedure</span> </div> </a> <ul id="toc-Procedure_4-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Applications_2" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Applications_2"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3.2.2</span> <span>Applications</span> </div> </a> <ul id="toc-Applications_2-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Ladder_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Ladder_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3.3</span> <span>Ladder search</span> </div> </a> <ul id="toc-Ladder_search-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Swim-line_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Swim-line_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3.4</span> <span>Swim-line search</span> </div> </a> <ul id="toc-Swim-line_search-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Searches_directed_from_the_surface" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Searches_directed_from_the_surface"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.4</span> <span>Searches directed from the surface</span> </div> </a> <ul id="toc-Searches_directed_from_the_surface-sublist" class="vector-toc-list"> <li id="toc-Directed_from_the_surface" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Directed_from_the_surface"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.4.1</span> <span>Directed from the surface</span> </div> </a> <ul id="toc-Directed_from_the_surface-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Towed_searches" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Towed_searches"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.4.2</span> <span>Towed searches</span> </div> </a> <ul id="toc-Towed_searches-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Searches_using_special_equipment" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Searches_using_special_equipment"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.5</span> <span>Searches using special equipment</span> </div> </a> <ul id="toc-Searches_using_special_equipment-sublist" class="vector-toc-list"> <li id="toc-Hand_held_sonar_transponders" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Hand_held_sonar_transponders"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.5.1</span> <span>Hand held sonar transponders</span> </div> </a> <ul id="toc-Hand_held_sonar_transponders-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Other_search_patterns" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Other_search_patterns"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.6</span> <span>Other search patterns</span> </div> </a> <ul id="toc-Other_search_patterns-sublist" class="vector-toc-list"> <li id="toc-Current_drift_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Current_drift_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.6.1</span> <span>Current drift search</span> </div> </a> <ul id="toc-Current_drift_search-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Depth_contour_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Depth_contour_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.6.2</span> <span>Depth contour search</span> </div> </a> <ul id="toc-Depth_contour_search-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Communication" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Communication"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.7</span> <span>Communication</span> </div> </a> <ul id="toc-Communication-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Deep_water_and_large_areas" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Deep_water_and_large_areas"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Deep water and large areas</span> </div> </a> <button aria-controls="toc-Deep_water_and_large_areas-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Deep water and large areas subsection</span> </button> <ul id="toc-Deep_water_and_large_areas-sublist" class="vector-toc-list"> <li id="toc-Search_sensors" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Search_sensors"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Search sensors</span> </div> </a> <ul id="toc-Search_sensors-sublist" class="vector-toc-list"> <li id="toc-Echo_sounders" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Echo_sounders"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1.1</span> <span>Echo sounders</span> </div> </a> <ul id="toc-Echo_sounders-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Side-scan_sonar" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Side-scan_sonar"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1.2</span> <span>Side-scan sonar</span> </div> </a> <ul id="toc-Side-scan_sonar-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Pinger_locators" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Pinger_locators"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1.3</span> <span>Pinger locators</span> </div> </a> <ul id="toc-Pinger_locators-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Magnetometers" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Magnetometers"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1.4</span> <span>Magnetometers</span> </div> </a> <ul id="toc-Magnetometers-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Optical_imaging_systems" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Optical_imaging_systems"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1.5</span> <span>Optical imaging systems</span> </div> </a> <ul id="toc-Optical_imaging_systems-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Other_search_tools" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Other_search_tools"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Other search tools</span> </div> </a> <ul id="toc-Other_search_tools-sublist" class="vector-toc-list"> <li id="toc-Navigation_systems" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Navigation_systems"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2.1</span> <span>Navigation systems</span> </div> </a> <ul id="toc-Navigation_systems-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Loss_data_analysis" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Loss_data_analysis"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2.2</span> <span>Loss data analysis</span> </div> </a> <ul id="toc-Loss_data_analysis-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Deep_water_search_patterns" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Deep_water_search_patterns"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Deep water search patterns</span> </div> </a> <ul id="toc-Deep_water_search_patterns-sublist" class="vector-toc-list"> <li id="toc-Parallel_grid_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Parallel_grid_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.1</span> <span>Parallel grid search</span> </div> </a> <ul id="toc-Parallel_grid_search-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Constant_range_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Constant_range_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.2</span> <span>Constant range search</span> </div> </a> <ul id="toc-Constant_range_search-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-"Z"_search" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#"Z"_search"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.3</span> <span>"Z" search</span> </div> </a> <ul id="toc-"Z"_search-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Search_coverage" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Search_coverage"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3.4</span> <span>Search coverage</span> </div> </a> <ul id="toc-Search_coverage-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Search_platforms" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Search_platforms"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Search platforms</span> </div> </a> <button aria-controls="toc-Search_platforms-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Search platforms subsection</span> </button> <ul id="toc-Search_platforms-sublist" class="vector-toc-list"> <li id="toc-Surface_vessels" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Surface_vessels"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Surface vessels</span> </div> </a> <ul id="toc-Surface_vessels-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Crewed_submersibles" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Crewed_submersibles"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Crewed submersibles</span> </div> </a> <ul id="toc-Crewed_submersibles-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Remotely_operated_underwater_vehicles" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Remotely_operated_underwater_vehicles"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Remotely operated underwater vehicles</span> </div> </a> <ul id="toc-Remotely_operated_underwater_vehicles-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Autonomous_underwater_vehicles" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Autonomous_underwater_vehicles"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.4</span> <span>Autonomous underwater vehicles</span> </div> </a> <ul id="toc-Autonomous_underwater_vehicles-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Aircraft" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Aircraft"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.5</span> <span>Aircraft</span> </div> </a> <ul id="toc-Aircraft-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-From_the_shore" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#From_the_shore"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>From the shore</span> </div> </a> <ul id="toc-From_the_shore-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" 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<div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Techniques for finding underwater targets</div> <p><b>Underwater searches</b> are procedures to find a known or suspected target object or objects in a specified search area under water. They may be carried out underwater by divers, manned <a href="/wiki/Submersibles" class="mw-redirect" title="Submersibles">submersibles</a>, <a href="/wiki/Remotely_operated_underwater_vehicle" title="Remotely operated underwater vehicle">remotely operated underwater vehicles</a>, or <a href="/wiki/Autonomous_underwater_vehicle" title="Autonomous underwater vehicle">autonomous underwater vehicles</a>, or from the surface by other agents, including surface vessels, aircraft and <a href="/wiki/Cadaver_dogs" class="mw-redirect" title="Cadaver dogs">cadaver dogs</a>. </p><p>A search method attempts to provide full coverage of the search area, and to do this a search pattern is usually applied, which is a systematic procedure for covering the search area. This is greatly influenced by the width of the sweep or sensor swath, which largely depends on the method used to detect the target. For divers in conditions of zero visibility, this is as far as the diver can feel with their hands while proceeding along the pattern, while for towed <a href="/wiki/Pinger_locators" class="mw-redirect" title="Pinger locators">pinger locators</a> it may be more than a kilometre to each side. When visibility is better, it depends on the distance at which the target can be seen from the pattern, or detected by sonar, optical sensors or magnetic field anomalies. In all cases, the search pattern should completely cover the search area without excessive redundancy or missed areas. Overlap is needed to compensate for inaccuracy and sensor error, and may be necessary to avoid gaps in some patterns. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Diver_searches">Diver searches</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=1" title="Edit section: Diver searches"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Diver searches are underwater searches carried out by <a href="/wiki/Underwater_diving" title="Underwater diving">divers</a>. There are a number of techniques in general use by <a href="/wiki/Professional_diving" title="Professional diving">commercial, scientific, public service, military</a>, and <a href="/wiki/Recreational_diving" title="Recreational diving">recreational divers</a>. Some of these are suitable for <a href="/wiki/Scuba_diving" title="Scuba diving">scuba</a>, and some for <a href="/wiki/Surface_supplied_diving" class="mw-redirect" title="Surface supplied diving">surface supplied diving</a>. The choice of search technique will depend on logistical factors, terrain, protocol and diver skills. </p><p>As a general principle, a search method attempts to provide 100% coverage of the search area. this is greatly influenced by the width of the sweep. In conditions of zero visibility this is as far as the diver can feel with his hands while proceeding along the pattern. When visibility is better, it depends on the distance at which the target can be seen from the pattern. In all cases then, the pattern should be accurate and completely cover the search area without excessive redundancy or missed areas. Overlap is needed to compensate for inaccuracy, and may be necessary to avoid gaps in some patterns. </p> <div class="mw-heading mw-heading3"><h3 id="Search_patterns_controlled_by_ropes_and_lines">Search patterns controlled by ropes and lines</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=2" title="Edit section: Search patterns controlled by ropes and lines"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading4"><h4 id="Circular_search">Circular search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=3" title="Edit section: Circular search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Circular_search_pattern.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Circular_search_pattern.png/220px-Circular_search_pattern.png" decoding="async" width="220" height="217" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Circular_search_pattern.png/330px-Circular_search_pattern.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Circular_search_pattern.png/440px-Circular_search_pattern.png 2x" data-file-width="3000" data-file-height="2963" /></a><figcaption>Standard circular search pattern</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Circular_search_pattern_SSDE.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Circular_search_pattern_SSDE.png/220px-Circular_search_pattern_SSDE.png" decoding="async" width="220" height="217" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Circular_search_pattern_SSDE.png/330px-Circular_search_pattern_SSDE.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/24/Circular_search_pattern_SSDE.png/440px-Circular_search_pattern_SSDE.png 2x" data-file-width="3000" data-file-height="2963" /></a><figcaption>Circular search pattern modified to avoid twisting or fouling an umbilical or lifeline</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Pendulum_search_pattern.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Pendulum_search_pattern.png/220px-Pendulum_search_pattern.png" decoding="async" width="220" height="353" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/24/Pendulum_search_pattern.png/330px-Pendulum_search_pattern.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/24/Pendulum_search_pattern.png/440px-Pendulum_search_pattern.png 2x" data-file-width="1844" data-file-height="2961" /></a><figcaption>Pendulum search pattern along a wall</figcaption></figure> <p>An underwater circular search is a procedure conducted by a diver moving around a fixed reference point, usually by <a href="/wiki/Human_swimming" class="mw-redirect" title="Human swimming">swimming</a>, at a series of distances (radii). The circular search is simple and requires little equipment. It is useful where the position of the objects of the search is known with reasonable accuracy.<sup id="cite_ref-BSAC_Sport_Diving_1985_1-0" class="reference"><a href="#cite_note-BSAC_Sport_Diving_1985-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 142">: 142 </span></sup> </p> <div class="mw-heading mw-heading5"><h5 id="Procedure">Procedure</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=4" title="Edit section: Procedure"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The general procedure is to start from a fixed central point, and to search the circumference of a circle where the radius is defined by a search line anchored at the central point. The radius of the circle is dependent on visibility, and is increased after each circle has been completed, by an amount which allows the diver to either see or feel an overlap between the current arc and the previous arc.<sup id="cite_ref-NOAA_2-0" class="reference"><a href="#cite_note-NOAA-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-CDM_3-0" class="reference"><a href="#cite_note-CDM-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>One end of the distance line is carried by the diver and the other is attached to the datum position by any appropriate method. E.g. clipped to the base of a shot line, pegged into the bottom, tied to a fixed object on the bottom or held by another diver. The diver may tow a surface marker buoy to show their position to the support team if conditions allow. The diver unreels a section of distance line appropriate to the visibility and marks the start position by a peg, loose marker, compass heading, or a pre-laid marker line extending outwards from the datum position. Then, keeping the line taut, the diver proceeds in a circle with the line as radius, searching visually or by feel until back at the start position. The diver then unreels another section of line of the same length and repeats the procedure until they find the object, run into obstacles or run out of line, air or time.<sup id="cite_ref-BSAC_Sport_Diving_1985_1-1" class="reference"><a href="#cite_note-BSAC_Sport_Diving_1985-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 142">: 142 </span></sup> </p><p>The amount of distance line increment for each sweep should allow some overlap of sweeps to avoid the risk of missing the target between sweeps. If a buddy is involved the most efficient place is alongside the controlling diver on the line, and the extension of distance line for each sweep can be roughly doubled. Depending on the circumstances, control of the pattern may be from the surface, from a diver at the central point, or by the diver at the end of the search line, who would in that case control the search line reel.<sup id="cite_ref-BSAC_Sport_Diving_1985_1-2" class="reference"><a href="#cite_note-BSAC_Sport_Diving_1985-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 142">: 142 </span></sup> </p> <div class="mw-heading mw-heading5"><h5 id="Variations_on_the_circular_search">Variations on the circular search</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=5" title="Edit section: Variations on the circular search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In some cases a second diver can establish themself at a fixed point on the bottom and act as both the central point and line tender. The diver and line tender <a href="/wiki/Communicate" class="mw-redirect" title="Communicate">communicate</a> with each other using line pull signals. When the diver has completed a full revolution of the search, the tender signals the diver and advances another section of line so the search can be expanded further from the central point. Another variation uses more than one diver along the search line. The divers are evenly spaced at a distance depending on visibility, and the increase in radius allows overlap of search area only for the innermost diver on the line. This variation becomes more difficult to coordinate with a larger number of divers, particularly in poor visibility.<sup id="cite_ref-BSAC_Sport_Diving_1985_1-3" class="reference"><a href="#cite_note-BSAC_Sport_Diving_1985-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 142">: 142 </span></sup> </p><p>A major variation on the circular search is the <b>pendulum search</b>, also known as the <b>arc</b> or <b>fishtail search</b>.<sup id="cite_ref-NOAA_2-1" class="reference"><a href="#cite_note-NOAA-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-CDM_3-1" class="reference"><a href="#cite_note-CDM-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> in which the diver stops and changes direction at the end of each arc. This is used when there is insufficient space to complete a circle, as when controlled from the shore, when the search area is limited to a sector to one side of the control point, or there is a major obstruction limiting the extent of the searchable sector. Divers on surface supply may change direction at the end of each arc even when using a full 360° pattern to avoid twisting the umbilical. The pendulum search can also be done with more than one diver on the search line, but this requires considerable skill and co-ordination, particularly in low visibility.<sup id="cite_ref-Hanekom_and_Truter_2007_4-0" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>Another variation is used where the target is large enough to snag the search line, In this case the diver may go out to the full radius of the search area and make a single sweep, hoping to snag the target with the line. If on his return to the start line or bearing, he finds he is closer to the centre point, he will swim back along the line in the expectation of having snagged something. With some luck it will be the target of the search. </p><p>If the target is not found by the time the search pattern has reached maximum convenient radius, the centre point may be shifted and another search started. This can be repeated as often as necessary, but the positions of the centre points must be chosen to allow the full search area to be covered. This implies quite a lot of overlap, and the pattern is not efficient. The most efficient pattern uses an equilateral triangular grid, but this may have to be modified to suit the site.<sup id="cite_ref-Hanekom_and_Truter_2007_4-1" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>The circular search is very popular as it does not require complicated setup and can be done by most divers without a great deal of special training. It is effective where the position of the target is known with reasonable accuracy, where the bottom terrain does not have major snags, and where the depth variation during each arc is acceptable.<sup id="cite_ref-Hanekom_and_Truter_2007_4-2" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading5"><h5 id="Safety">Safety</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=6" title="Edit section: Safety"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Divers should be well trained in general diving skills before attempting this type of search. The search diver is responsible for maintaining sufficient tension on the search line so the signals can be transmitted and received. If a surface marker is used, slack in the line should be kept to a minimum to avoid entanglement. This is easiest if a reel is used to control the line, or alternatively the line should be buoyant, to keep it as far from the divers as possible, but buoyant lines will still tend to wrap around the shotline in the centre if there is enough slack.<sup id="cite_ref-Hanekom_and_Truter_2007_4-3" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Jackstay_searches">Jackstay searches</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=7" title="Edit section: Jackstay searches"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Jackstay_search_pattern.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Jackstay_search_pattern.png/220px-Jackstay_search_pattern.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Jackstay_search_pattern.png/330px-Jackstay_search_pattern.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/47/Jackstay_search_pattern.png/440px-Jackstay_search_pattern.png 2x" data-file-width="2963" data-file-height="2963" /></a><figcaption>Jackstay search pattern</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Jackstay_J_search_pattern.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/17/Jackstay_J_search_pattern.png/220px-Jackstay_J_search_pattern.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/17/Jackstay_J_search_pattern.png/330px-Jackstay_J_search_pattern.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/17/Jackstay_J_search_pattern.png/440px-Jackstay_J_search_pattern.png 2x" data-file-width="3000" data-file-height="3000" /></a><figcaption>Jackstay "J" search pattern</figcaption></figure> <p>An underwater <b>jackstay search</b> is a procedure conducted by <a href="/wiki/Scuba_diver" class="mw-redirect" title="Scuba diver">divers</a> <a href="/wiki/Human_swimming" class="mw-redirect" title="Human swimming">swimming</a> along a search line - the <a href="/wiki/Jackstay_(diving)" class="mw-redirect" title="Jackstay (diving)">jackstay</a>. </p><p>There are various techniques for performing a jackstay search. </p> <div class="mw-heading mw-heading5"><h5 id="Procedure_2">Procedure</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=8" title="Edit section: Procedure"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The procedure for a search using two fixed jackstays and a movable search line is described:<sup id="cite_ref-CDM_3-2" class="reference"><a href="#cite_note-CDM-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>The distance between the fixed jackstays will depend on circumstances, but should not be so long that reliable overlapping of sweeps is prevented. This will depend on the bottom terrain. Two divers are generally used on this search system. Two heavy jackstays are laid parallel to each other across the bottom of the search area. A lighter movable jackstay is used to connect the fixed jackstays at one end of the search area. This line is kept reasonably taut, but must not pull the fixed jackstays together.<sup id="cite_ref-Hanekom_and_Truter_2007_4-4" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>The divers start at opposite ends of the movable jackstay and swim along it, each diver holding the line with his left hand (or right, but both must use the same hand to keep them on opposite sides of the line) and searching the bottom visually or by feel on his side of the line until he passes the other diver and reaches the other fixed jackstay, at which point he will signal to the other diver that he has reached this point by a pull signal on the movable jackstay.<sup id="cite_ref-BSAC_Sport_Diving_1985_1-4" class="reference"><a href="#cite_note-BSAC_Sport_Diving_1985-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 141">: 141 </span></sup> </p><p>When both divers are at the fixed jackstays they will shift the movable jackstay along the fixed jackstays by an agreed distance depending on conditions. The distance should be large enough to reduce excessive overlap, but small enough that there is no risk of missing the target between traverses. This usually means that the distance is between the reach of the divers searching by feel in low visibility, and the distance they can see to the sides plus width of the target in good visibility. Care must be taken to always shift the movable jackstay in the same direction. This can be easily confused in low visibility, so a compass can be used to prevent this problem.<sup id="cite_ref-Hanekom_and_Truter_2007_4-5" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>The divers then repeat this process until they find the object or run out of fixed jackstay, time or air. When a diver finds the object he should signal this to the other diver by rope pulls. The second diver can join him to confirm the finding and mark it or continue the search. If the movable jackstay snags it should be freed by the divers as the pass the snag. The sweep may have to be repeated after freeing a snag. The method of attaching the movable jackstay should be easily adjustable, but reliable.<sup id="cite_ref-Hanekom_and_Truter_2007_4-6" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>If a series of sweeps does not find the object, one of the fixed jackstays may be lifted and re-laid on the opposite side of the remaining one, and the process repeated until the target is found or the entire search area has been searched.<sup id="cite_ref-Hanekom_and_Truter_2007_4-7" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading5"><h5 id="Variations_on_the_jackstay_search">Variations on the jackstay search</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=9" title="Edit section: Variations on the jackstay search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>If the body of water is narrow enough, a surface team can lay a single jackstay across the width of the bottom, and the diver/s swim from one side to the other. When they reach the end of the line in the water, the surface team advance the jackstay by an appropriate amount by lifting it, moving it parallel to the original position and laying it down again, at which stage the divers make another sweep. This is repeated as often as necessary. </p><p>Another method, sometimes called a "J" search, and suitable for a solo diver, involves the diver or divers starting at the <i>same</i> end of the search line, which is similarly set along the edge of the search area. The two divers swim together, one on each side of the line, thereby searching the area immediately to either side of the line.<sup id="cite_ref-Hanekom_and_Truter_2007_4-8" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>Once they have completed the sweep, they reset the end of the line a few meters further into the search area, so that the line now runs at a slight angle to its original course. They then sweep back along the line, either searching much of the same ground over again, or simply returning to the start point. Once they reach the start point, they then move the other end of the line a few meters further into the search area so that the line is once again parallel to its original position.<sup id="cite_ref-Hanekom_and_Truter_2007_4-9" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>They repeat this pattern until the object of the search is located, or until they cover the entire search area. This second method is longer and slower, and is used more frequently either in extremely limited visibility, where the divers do not wish to lose contact with each other, or where the object sought is particularly small, and they wish to run the pattern twice, once from each side, in case the object is masked by a larger object on the sea bed when approach from one side, and particularly where only one diver is available to do the search.<sup id="cite_ref-Hanekom_and_Truter_2007_4-10" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading5"><h5 id="Safety_2">Safety</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=10" title="Edit section: Safety"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Divers should be well trained before attempting this type of search. Solo divers should be used only when a risk assessment indicates that the risks are acceptable, and preferably should indicate their position with a surface marker or be in communication with the surface by line or voice. </p> <div class="mw-heading mw-heading5"><h5 id="Snag-line_search">Snag-line search</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=11" title="Edit section: Snag-line search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Snagline_search_pattern.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Snagline_search_pattern.png/220px-Snagline_search_pattern.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Snagline_search_pattern.png/330px-Snagline_search_pattern.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Snagline_search_pattern.png/440px-Snagline_search_pattern.png 2x" data-file-width="3000" data-file-height="3000" /></a><figcaption>Snagline search pattern using jackstays to define the search area</figcaption></figure> <p>When the object of the search is large enough and of suitable form to snag a dragged line, a snag-line may be used to speed up the process. The snag-line may be used with a pair of fixed jackstays or as a distance line for a circular search. It is often a weighted line, though there may be times when this is not required. The snag-line is held taut by the diver or divers, who will then drag it along the bottom as they either follow the jackstays or swim the arc until it hooks on something. When this happens the divers fasten their snag-line ends in position by tying or clipping them to the jackstays or pegging them to the ground, and swim along the snag-line to identify the target, If it is the object of the search, they will mark it, otherwise they free the line, move it over the target, return to their ends and continue the sweep.<sup id="cite_ref-CDM_3-3" class="reference"><a href="#cite_note-CDM-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Hanekom_and_Truter_2007_4-11" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Cave_diving_emergency_searches">Cave diving emergency searches</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=12" title="Edit section: Cave diving emergency searches"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Separation from the guideline in a cave can be a life-threatening emergency. If a diver loses the guideline, it is their first priority to find it again. For the rest of the team if they have not lost the guideline, finding the lost buddy is their second priority after ensuring their own safety. Both of these situations are emergencies that cave divers are trained to respond to, but there is no method that guarantees success for either problem in all situations. This is a risk that scuba divers must accept if they choose to dive in caves. </p> <div class="mw-heading mw-heading4"><h4 id="Searches_for_lost_guideline">Searches for lost guideline</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=13" title="Edit section: Searches for lost guideline"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Cave_diving#Lost_line" title="Cave diving">Cave diving § Lost line</a></div> <p>There are two types of lost line situation in penetration diving. One is when a diver is separated from the line and does not know where it or the other divers are, and the other is when the team find that the guideline ahead of them has broken and the other end is not in sight. The first type is a life-threatening emergency for the diver who has lost the line, the second type is a life-threatening emergency to the dive team if it occurs during the exit, but an inconvenience on the way in, as they can turn back at any time, though an attempt to find the other end and repair the line is normal practice. </p><p>Losing the guide line in a cave is a potentially life-threatening emergency. While following recommended best practice makes it highly unlikely that a diver will lose the line, it can and does happen, and there are procedures which will usually work to find it again. Any reliable information on where the diver is likely to be relative to the last known position of the line may be critical, and the procedure of choice will depend on what is reliably known. In all situations, the diver will attempt to stabilise the situation and avoid getting further lost, and make a thorough visual check in all directions from where they are at the time, taking into account the possibility of the line being in a <span title="See entry on this page at § line trap" class="glossary-link-internal" style="border-bottom: 1px dashed #86a1ff; color:initial;"><a href="/wiki/Glossary_of_underwater_diving_terminology:_H%E2%80%93O#line_trap" title="Glossary of underwater diving terminology: H–O">line trap</a></span>. If the diver has not also separated from their buddy, the buddy may know where the line is, and can be asked, and if the diver is separated from their buddy, the buddy may be at the line, and the buddy's light may be visible.<sup id="cite_ref-Line_drills_5-0" class="reference"><a href="#cite_note-Line_drills-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>Stabilising the position is generally done by finding the nearest feasible tie-off point and securely tying off a search line. The direction of the guide line when last seen should be known, and therefore the direction the diver was swimming in before losing the line. If the diver was neutrally buoyant while following the line, the approximate depth can be reconstructed by finding the depth of neutral buoyancy again, without adjusting inflation of BCD or dry suit. Unless the line was lost by the diver not noticing a change of direction, it is likely to be at much the same depth, in much the same direction, and at a similar lateral and vertical distance as when last seen, making it logical to try that direction first. While swimming towards the estimated position of the line and slowly paying out search line, the diver will search visually, and in low visibility or darkness, also by feel, making arm sweeps across the expected direction of the line, while defending the head from impact with the other arm. The distance swum towards the estimated position of the lost line can be measured by the spacing and number of knots paid out on the search line. If the search fails, the diver will return to the tie off and try again in the next best guess for the direction the line may be.<sup id="cite_ref-Line_drills_5-1" class="reference"><a href="#cite_note-Line_drills-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> The diver may also choose to try a different search method. The best search method for any given situation will depend on the water conditions, the layout of the section of cave, the way the line was laid, the situational knowledge and skills of the diver, and the equipment available – a method that would be ideal for one situation might not work at all for another. </p><p>If the line is found, but not the other divers, the diver can tie off their search reel to the guide line as an indicator to other members of the team that they were lost but have found the guide line, and indicate the direction that they intend to proceed along the guideline with a personal directional marker so that others who see it while searching for the lost diver will know whether the diver chose the right direction to exit the cave.<sup id="cite_ref-Line_drills_5-2" class="reference"><a href="#cite_note-Line_drills-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> A compass is usually a reliable indicator of direction in a cave, but only useful if the diver knows the approximate direction they were swimming before losing the line, as some caves have many changes of direction along the passages. </p> <div class="mw-heading mw-heading4"><h4 id="Lost_buddy_search">Lost buddy search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=14" title="Edit section: Lost buddy search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Cave_diving#Lost_buddy" title="Cave diving">Cave diving § Lost buddy</a></div> <p>A diver on an intact guide line is generally not considered lost. It is the diver who has lost the guide line who is lost, so the most important consideration for searching for a lost diver is not to lose the guide line. This is generally the converse situation to the lost guide line, in that the diver loses contact with their buddy or team but remains in contact with the guide line, so is not themself lost. Their first priority is to not get lost or disorientated, and in furtherance of this aim would attach a directional line marker to the guide line indicating the direction to the exit before starting a search. The search line can be tied to the directional maker to prevent it from sliding along the line during the search. The direction for the search would depend on the layout of that part of the cave, and where the missing diver should have been in the group. The search party must consider their own safety first, regarding how much gas they can afford to use in a search, which will depend on the stage of the dive when the diver is noticed to be missing. When searching in darkness, the searches should periodically turn off their lights as this will allow them to see the lost diver's light more easily.<sup id="cite_ref-Line_drills_5-3" class="reference"><a href="#cite_note-Line_drills-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Search_patterns_controlled_by_compass_directions">Search patterns controlled by compass directions</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=15" title="Edit section: Search patterns controlled by compass directions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Compass directed searches do not require extensive preparation and can be performed with very little additional equipment, but require suitable conditions and a relatively high level of navigational skill. They can be significantly degraded by currents which will offset the divers from the theoretical search pattern in proportion to elapsed time and current velocity. They are best suited to targets that will easily be seen, and require the diver's attention to be divided between the compass and the visual search, so work best where the water visibility and target characteristics allow the spotting of the target by peripheral vision while focused on accurately following the search pattern. </p> <div class="mw-heading mw-heading4"><h4 id="Spiral_box_search">Spiral box search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=16" title="Edit section: Spiral box search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Compass_box_search_pattern.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Compass_box_search_pattern.png/220px-Compass_box_search_pattern.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Compass_box_search_pattern.png/330px-Compass_box_search_pattern.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Compass_box_search_pattern.png/440px-Compass_box_search_pattern.png 2x" data-file-width="2963" data-file-height="2963" /></a><figcaption>The spiral box search pattern</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Expanding_square_search" class="mw-redirect" title="Expanding square search">Expanding square search</a></div> <p>An underwater spiral box search is a search procedure conducted by a diver swimming around a starting point on a pattern based on compass directions and increasing distances. The pattern resembles an outward spiral with straight sides and equal distances between legs swum on the same bearing. The legs are normally swum with 90 degree change in direction between them, and very often the cardinal directions are used for ease of navigation. The spiral may be clockwise or anticlockwise, and in theory there is no limit to the area which can be covered. In practice, the diver may encounter an obstacle such as the shore, or will run out of air or energy, which will terminate the pattern. Finding a specified target would also result in the termination of the search in most cases.<sup id="cite_ref-BSAC_Sport_Diving_1985_1-5" class="reference"><a href="#cite_note-BSAC_Sport_Diving_1985-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 143">: 143 </span></sup> </p> <div class="mw-heading mw-heading5"><h5 id="Procedure_3">Procedure</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=17" title="Edit section: Procedure"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The technique is to start at the estimated position of the target, at a distance above the bottom to provide the best view, and to swim in a cardinal direction a distance roughly equal to or slightly greater than the visibility range. The estimate of distance is commonly by kick counts, so using a whole number of kicks is necessary, and preferably a number which can be mentally accumulated by the diver. Call this distance n kicks, where n is usually 2, 4, 5, 10 or 20 as these are easy numbers to multiply mentally. The direction of turn may be clockwise or anticlockwise as best suits the search. </p><p>For example: The diver swims n kicks to the north, turns left and swims n kicks to the west, then turns left and swims 2n kicks to the south, left again and 2n kicks to the east. Then left again and 3n kicks to the north, left and 3n kicks to the west. The pattern is repeated by adding an extra n kicks every second turn, and always turning the same way. If at any stage the diver wants to return to the start point, he will swim a half leg count followed by the usual turn and another half leg count. </p> <div class="mw-heading mw-heading5"><h5 id="Applications">Applications</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=18" title="Edit section: Applications"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This search pattern is particularly suited for occasions when the approximate position of the search target is known, but the divers have no facilities for setting up a position marker or search lines, but have a compass and the skills to use it effectively. The pattern is not greatly affected by obstructions and potential snags, but works best with targets that are relatively easy to see, and that usually implies fairly large size and fairly good visibility. The gap between the parallel legs is chosen for easy counting and sufficient overlap to provide a good chance of spotting the target. </p><p>The pattern is not suited to water where there is a current, though moderate surge does not make much difference to the accuracy, provided the horizontal movement due to the surge is not bigger than the overlap between two adjacent parallel legs. Errors are cumulative: A return to the centre is a good check for accuracy. If the diver ends up close to the start point, the pattern was swum accurately. </p> <div class="mw-heading mw-heading4"><h4 id="Compass_grid_search">Compass grid search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=19" title="Edit section: Compass grid search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An underwater compass grid search is a search pattern conducted by a diver swimming parallel lines on a compass bearing and its reciprocal while conducting a visual search of the area bordering the track. The separation between lines is chosen to allow sufficient overlap to ensure a high probability of the search target being seen if the diver passes by. Cardinal directions are often chosen for ease of navigation, but topographical constraints may dictate bearings that suit the site better. </p> <div class="mw-heading mw-heading5"><h5 id="Procedure_4">Procedure</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=20" title="Edit section: Procedure"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The diver or divers swim pre-arranged compass courses arranged in a grid pattern to cover the search area. </p> <div class="mw-heading mw-heading5"><h5 id="Applications_2">Applications</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=21" title="Edit section: Applications"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A large number of divers can be simultaneously deployed to cover a large search area quickly, or a single diver can methodically work through the same area. The pattern is limited to relatively low current speeds, as the current will set the divers off their planned paths. </p> <div class="mw-heading mw-heading4"><h4 id="Ladder_search">Ladder search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=22" title="Edit section: Ladder search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This pattern is a version of the grid search where the length of the leg is relatively short. It is more limited, but works well in narrow passages, like a river or canal. The search pattern is swimming back and forth on reciprocal headings with an equal offset in the same direction at the end of each leg. Direction of the legs is usually determined by some geographical feature, and the bezel of the compass can be set to those directions. If the direction of the channel changes it may be necessary to change the search leg headings accordingly, so that they remain roughly transverse to the channel. The offset is not critical for direction, and so long as it is roughly correct will be OK. The length of the search legs will usually also be determined by some physical feature like the width of the canal, or reaching a depth of 10m, and the legs may not be of constant length. What is important is that they are parallel and each is offset the same amount in the same direction, so that the search area is covered completely. The search pattern corresponds closely to that of the Jackstay grid search, and is sometimes referred to as a U-pattern search.<sup id="cite_ref-Azul_6-0" class="reference"><a href="#cite_note-Azul-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Swim-line_search">Swim-line search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=23" title="Edit section: Swim-line search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Swimline_search_pattern.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Swimline_search_pattern.png/220px-Swimline_search_pattern.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Swimline_search_pattern.png/330px-Swimline_search_pattern.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Swimline_search_pattern.png/440px-Swimline_search_pattern.png 2x" data-file-width="3000" data-file-height="3000" /></a><figcaption>Swimline search pattern</figcaption></figure> <p>This is the visual equivalent of the snag-line search. A team of divers spreads out along a length of rope at spacing suited to the visibility, terrain and size of the target. The team leader may theoretically be anywhere on the rope, but is usually at one end or in the middle. He swims on a constant heading which is known to all the divers, who swim on the same heading. Each diver must ensure that he does not get ahead of or lag behind the diver to his side who is closer to the leader, and that the rope is kept taut. In this way an evenly spaced line of divers swims a straight sweep with a width equal to the length of the swim line. It can work but requires concentration and a bit of practice, as all the divers are also supposed to be diligently searching for the target. The swim line method can also be applied to a circular pattern, but this is inefficient and usually badly co-ordinated as the direction is constantly changing. A variation on this pattern that can work is in a river or canal where the ends are controlled by line tenders on the banks, who can communicate and can sweep the line round curves. Complications arise with variations in width but most of these can be dealt with by planning ahead. Line signals can instruct the divers to adjust their spacing to suit conditions.<sup id="cite_ref-CDM_3-4" class="reference"><a href="#cite_note-CDM-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Hanekom_and_Truter_2007_4-12" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Searches_directed_from_the_surface">Searches directed from the surface</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=24" title="Edit section: Searches directed from the surface"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading4"><h4 id="Directed_from_the_surface">Directed from the surface</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=25" title="Edit section: Directed from the surface"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A diver who is in communication with the surface by line signals or by voice communication may be directed to and around a search area from the surface. This has a relatively limited scope, but can work in some cases, particularly when the surface team has a real time sonar picture of the target and the diver in bad visibility. This may be considered not to be a search, as the target can be seen, and the position known, but it is not always possible to get a positive identification until the diver gets there, and there may be several potential targets to check. The technique is also sometimes used when the approximate position can be judged from the surface, but the diver still needs to do some searching once in the desired position.<sup id="cite_ref-Hanekom_and_Truter_2007_4-13" class="reference"><a href="#cite_note-Hanekom_and_Truter_2007-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Towed_searches">Towed searches</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=26" title="Edit section: Towed searches"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>One or two divers can be towed behind a boat at speeds up to 3.5 or 4 km per hour to do visual searches. They steer and control their depth by using a tow board, which may be equipped with a safety quick disconnect mechanism and drop-floats to mark targets.<sup id="cite_ref-Dowsett_2016_7-0" class="reference"><a href="#cite_note-Dowsett_2016-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>Suitable for searching large area in good visibility for a large target. The diver must be careful not to ascend too quickly. When a target is seen the diver will disconnect the board and send up a marker buoy, which will indicate the position of the target and the diver, allowing the boat to approach with caution while the diver ascends. The search pattern is controlled by the skipper of the boat, and may follow a GPS defined route. If the visibility is good enough or the water shallow, the divers can search while towed at the surface.<sup id="cite_ref-Ventura_8-0" class="reference"><a href="#cite_note-Ventura-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Searches_using_special_equipment">Searches using special equipment</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=27" title="Edit section: Searches using special equipment"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading4"><h4 id="Hand_held_sonar_transponders">Hand held sonar transponders</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=28" title="Edit section: Hand held sonar transponders"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:US_Navy_100708-N-4776G-203_Explosive_Ordnance_Disposal_Technician_3rd_Class_Jonathan_Sokol_conducts_training_on_a_AN-PQS_2A_hand_held_sonar.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9c/US_Navy_100708-N-4776G-203_Explosive_Ordnance_Disposal_Technician_3rd_Class_Jonathan_Sokol_conducts_training_on_a_AN-PQS_2A_hand_held_sonar.jpg/220px-US_Navy_100708-N-4776G-203_Explosive_Ordnance_Disposal_Technician_3rd_Class_Jonathan_Sokol_conducts_training_on_a_AN-PQS_2A_hand_held_sonar.jpg" decoding="async" width="220" height="146" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9c/US_Navy_100708-N-4776G-203_Explosive_Ordnance_Disposal_Technician_3rd_Class_Jonathan_Sokol_conducts_training_on_a_AN-PQS_2A_hand_held_sonar.jpg/330px-US_Navy_100708-N-4776G-203_Explosive_Ordnance_Disposal_Technician_3rd_Class_Jonathan_Sokol_conducts_training_on_a_AN-PQS_2A_hand_held_sonar.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9c/US_Navy_100708-N-4776G-203_Explosive_Ordnance_Disposal_Technician_3rd_Class_Jonathan_Sokol_conducts_training_on_a_AN-PQS_2A_hand_held_sonar.jpg/440px-US_Navy_100708-N-4776G-203_Explosive_Ordnance_Disposal_Technician_3rd_Class_Jonathan_Sokol_conducts_training_on_a_AN-PQS_2A_hand_held_sonar.jpg 2x" data-file-width="4256" data-file-height="2832" /></a><figcaption>US Navy diver training in the use of a hand held sonar device</figcaption></figure> <p>Divers can use sonar units. They use be active sonar (transponders that emit a signal and measure the return signal strength to determine obstructions in a given direction) or passive (transponders which measure a signal emitted by the target). </p><p>A signal transmitter attached to the target instrumentation package is often used to allow scientists to recover instrumentation relatively quickly, where the position can not be marked at the surface by a buoy. The diver carries a receiver which is tuned to the frequency of the transmitter and is usually capable of indicating signal strength and the direction, allowing the diver to proceed towards it on a fairly direct route. The transmitter may be triggered by a coded sonar signal from the surface or by a timer. </p><p>Inertial navigation instruments which can be used to give a precise position to the diver can be used to follow a planned search pattern in much the same way that a compass is used, but are better in currents, as they give an absolute position and directions. </p> <div class="mw-heading mw-heading3"><h3 id="Other_search_patterns">Other search patterns</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=29" title="Edit section: Other search patterns"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading4"><h4 id="Current_drift_search">Current drift search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=30" title="Edit section: Current drift search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Divers are spaced out across the direction of current flow and search as they are carried over the bottom by the current. They would usually be monitored from the surface using marker buoys so that the effectiveness of coverage can be assessed, and the search is likely to be most effective in good visibility and in areas where the current velocity is reasonably consistent. This is very similar in effect to the swimline visual search, and the techniques can be combined. </p> <div class="mw-heading mw-heading4"><h4 id="Depth_contour_search">Depth contour search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=31" title="Edit section: Depth contour search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Steeply sloping bottoms can sometimes be effectively searched by divers swimming at constant depth, following the contours of the bottom. Depth control may be by gauge, but is very effectively managed by towing a surface marker buoy with the line length set to the desired depth, provided that the surface is not too rough. </p> <div class="mw-heading mw-heading3"><h3 id="Communication">Communication</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=32" title="Edit section: Communication"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Diver_communications" title="Diver communications">Diver communications</a></div> <p>Most public safety divers and many <a href="/wiki/Recreational" class="mw-redirect" title="Recreational">recreational</a> divers communicate by line signals while conducting searches underwater on scuba. Some jurisdictions may require public safety divers to use voice communications, which may be through water or wired systems. Surface supplied divers communicate with the surface support team by wired telephony. </p> <div class="mw-heading mw-heading2"><h2 id="Deep_water_and_large_areas">Deep water and large areas</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=33" title="Edit section: Deep water and large areas"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>It is only since the second half of the twentieth century that technology has been developed capable of locating small objects on the seafloor and allowing recovery of objects from far deeper than divers can work. The development of towed side-scan sonar and similar technology has improved the probability of successful deep searches. Dragging with grapnels, searches by divers, and searches using low-resolution sonar were previously the tools available for ocean search. Such searches were difficult, limited in depth and had a very low probability of success.<sup id="cite_ref-Salvage_manual_040_9-0" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 1">: Ch. 1 </span></sup> </p><p>Underwater search is a basic aspect of deep water salvage operations, as before an object can be recovered, it must first be found, inspected and identified, and the position recorded so that it can be returned to when necessary. Deep water searches are often complex and difficult, and good planning and preparation, and precise execution of the plan increase the chances of success.<sup id="cite_ref-Salvage_manual_040_9-1" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p>The main factors to be considered when planning a search system are:<sup id="cite_ref-Salvage_manual_040_9-2" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <ul><li>whether there are acoustic pingers, transponders or other location aids.</li> <li>datum quality – the accuracy and reliability of the existing position information,</li> <li>target characteristics (size, material and breakup characteristics),</li> <li>water depth and other characteristics,</li> <li>seafloor type and topography,</li> <li>prevailing weather conditions,</li> <li>geographical location,</li> <li>equipment availability.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Search_sensors">Search sensors</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=34" title="Edit section: Search sensors"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Sound penetrates well through water compared to light and most other electromagnetic radiations, so sensors using active sound signals have relatively good range, but as the resolution depends on frequency, sonar has limited resolution for longer range work. Passive sound detection has a much longer range, but at best can determine approximate direction of the source. Light penetration is far less than sound, and is limited by turbidity and absorption, with blue-green frequencies being least affected by absortpion in clean water, and giving high resolution but very limited range. Magnetic field variations are not limited by penetration but have extremely low resolution and weak field strength, and sensors are limited to detecting the presence of a magnetic anomaly. </p> <div class="mw-heading mw-heading4"><h4 id="Echo_sounders">Echo sounders</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=35" title="Edit section: Echo sounders"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Echo_sounder" class="mw-redirect" title="Echo sounder">Echo sounder</a></div> <p>Single and <a href="/wiki/Multi-beam_echo_sounder" class="mw-redirect" title="Multi-beam echo sounder">multi-beam echo sounders</a> are a type of sonar that can measure the bottom profile along the track of the ship. It is usual for single beam echo sounders to be permanently installed on a ship with the transducer arrays mounted through the hull.<sup id="cite_ref-Salvage_manual_040_9-3" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> Multi-beam systems may be permanent or portable and mounted over the side or towed. Resolution depends on frequency and height above the bottom, depth range depends to some extent on frequency, and accuracy depends on the accuracy of positional data for the transducers. Sonar searches generally rely on expert human interpretation of a computer generated image of the bottom topography to detect and identify a target. </p> <div class="mw-heading mw-heading4"><h4 id="Side-scan_sonar">Side-scan sonar</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=36" title="Edit section: Side-scan sonar"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Side-scan_sonar" title="Side-scan sonar">Side-scan sonar</a> uses acoustic transducers towed underwater to produce a plan view image of the seafloor showing details of the topography and artifacts to the sides of the track. The swath of seafloor covered in a single pass by side-scan sonar is relatively wide and therefore it is a relatively efficient search system with a high confidence for detecting and identifying a target, and is considered one of the most effective tools for underwater search.<sup id="cite_ref-Salvage_manual_040_9-4" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p>The effective resolution of side-scan sonar depends largely on the operating frequency; the higher the frequency, the greater the resolution, but swath width coverage is inversely related to frequency, so that the higher the frequency, the smaller the area of seafloor covered in a single pass.<sup id="cite_ref-Salvage_manual_040_9-5" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Pinger_locators">Pinger locators</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=37" title="Edit section: Pinger locators"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/w/index.php?title=Pinger-locator&action=edit&redlink=1" class="new" title="Pinger-locator (page does not exist)">Pinger-locators</a> are a class of passive acoustic search systems that do not produce any sound - they only detect sound within a specific frequency range. They are useful for finding artifacts that have been equipped with an <a href="/wiki/Acoustic_beacon" class="mw-redirect" title="Acoustic beacon">acoustic beacon</a> (pinger) to aid in location, such as <a href="/wiki/Cockpit_voice_recorder" class="mw-redirect" title="Cockpit voice recorder">cockpit voice recorders</a> and <a href="/wiki/Flight_data_recorder" class="mw-redirect" title="Flight data recorder">flight data recorders</a> used by nearly all military and commercial aircraft, which have a 37 kHz acoustic pinger to help locate them in case of a crash at sea.<sup id="cite_ref-Salvage_manual_040_9-6" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p>Pinger-locators that use an omnidirectional hydrophone have a maximum detection range of about one nautical mile (1,850 meters). The omnidirectional hydrophone cannot give bearing information, so several passes must be made over the pinger to pinpoint its position. A pinger-locator that uses a tuned array with a narrow directional hydrophone can give directional information and has increased detection range of up to about two nautical miles. Towed pinger-locators (TPLS) are towed through the search area much like a side-scan sonar, but at a higher speed. Because of their long range, they tend to be effective at locating the target in a shorter time. Pinger-locators designed for hand-held operations from the surface or by divers, have a shorter range.<sup id="cite_ref-Salvage_manual_040_9-7" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Magnetometers">Magnetometers</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=38" title="Edit section: Magnetometers"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Magnetometer" title="Magnetometer">Magnetometers</a> are only sensitive to electromagnetic fields that differ from the local geomagnetic field. In most applications relating to salvage this is a fairly large mass of steel or iron. They have a relatively limited detection range, as the target is not usually strongly magnetised, and can also pick up volcanic rock if present in large amounts.<sup id="cite_ref-Salvage_manual_040_9-8" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p>The magnetic signal strength of an object is inversely proportional to the cube of the distance between the sensor and the object, so magnetometers are not often used as the primary sensor for deep ocean searches, but they can be useful as a secondary sensor to a side-scan sonar search, particularly in situations where the target is lost within an environment rich in false targets, such as a field of rocks, and the sonar return from the target is not easily distinguished from those of the rocks. By correlating positive signals from both the side-scan sonar and a magnetometer sensor towed in tandem, the probability of detection of the object can be significantly improved. A magnetometer is also one of the few instruments capable of locating an object that is buried deeply in bottom sediments.<sup id="cite_ref-Salvage_manual_040_9-9" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Optical_imaging_systems">Optical imaging systems</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=39" title="Edit section: Optical imaging systems"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Optical imaging systems have been successfully used in deep ocean searches, either independently or in combination with a side-scan sonar. The obvious advantage of an optical imaging system is that the image produced can result in identification of the target without the need for time-consuming contact classification. The actual sensing devices used in optical imaging include still photographic cameras, real-time video cameras, and laser-imaging systems, using <a href="/wiki/Lidar" title="Lidar">lidar</a> technology. Still and video cameras rely on conventional strobe or floodlights as their illumination source. Due to limitations imposed by attenuation of the light and backscattering, still and video sensors need to be within 10 to 20 meters of a target to identify it. A laser-imaging system utilizes a blue/green laser as the illumination source to minimize attenuation and backscattering problems and can image targets as far as 50 meters away. The disadvantages of these systems are a result of high sensitivity to turbidity and underwater visibility, and include a relatively very narrow swath width and range compared to sonar, which results in relatively low towfish altitudes, and low overall search rate.<sup id="cite_ref-Salvage_manual_040_9-10" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Other_search_tools">Other search tools</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=40" title="Edit section: Other search tools"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The data produced by search sensors is not very useful in isolation. The exact position and orientation of the transducer at the time of acquisition is necessary to reference the three dimensional geographical position of the contacts found, so they can be analysed and where possible, identified, as either the target of the search or false positives, and so that it is possible to return to any contact for further investigation or recovery efforts.<sup id="cite_ref-Salvage_manual_040_9-11" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Navigation_systems">Navigation systems</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=41" title="Edit section: Navigation systems"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Accurate and repeatable navigation is an essential requirement for deep ocean search operations. The basic requirements are the ability to steer the vessel on the planned search pattern, to precisely track the position of the sensors on the search vessel or towfish, and to return to any position at a later time.<sup id="cite_ref-Salvage_manual_040_9-12" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> Positions logged by the search sensors are relative to the position and orientation of the sensors at the time, so the accuracy of the data depends on the accuracy of the navigation system, though <a href="/w/index.php?title=Data_post-processing&action=edit&redlink=1" class="new" title="Data post-processing (page does not exist)">data post-processing</a> for <a href="/wiki/Differential_GPS" title="Differential GPS">differential GPS</a> corrections is possible if DGPS is not available in real-time. </p> <div class="mw-heading mw-heading4"><h4 id="Loss_data_analysis">Loss data analysis</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=42" title="Edit section: Loss data analysis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/w/index.php?title=Loss_data_analysis&action=edit&redlink=1" class="new" title="Loss data analysis (page does not exist)">Loss data analysis</a> is the process of defining the search area and most probable target location by the acquisition and analysis of all available information related to the loss of an object. This task is the start of the planning process and will usually influence the other planning activities, such as equipment selection and search pattern design. The first step is to compile all of the information available from the actual scene of the loss. This may require a first-hand visit to the scene by the search specialist to interview eyewitnesses as soon as possible, because it is well known that information degrades with time. The following information is usually important:<sup id="cite_ref-Salvage_manual_040_9-13" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <ul><li>Times of the loss and other related events.</li> <li>Eyewitness and survivor accounts describing the loss.</li> <li>Position of the loss or last contact with the object</li> <li>Position of floating debris.</li> <li>Position of survivor rescues.</li> <li>Weather conditions at the time of loss</li> <li>Water conditions at the time of loss</li></ul> <p>All information, and its sources, should be analyzed for probable accuracy. It is typical that some data will be contradictory and a judgement will have to be made regarding the probability of accuracy of each. The search area box around the most probable seafloor position must account for the cumulative error or the uncertainty inherent in the deduced position. The confidence level that the target lies within the search box should be high before the actual search commences.<sup id="cite_ref-Salvage_manual_040_9-14" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p><b>Search probability analysis</b> </p><p><a href="/w/index.php?title=Search_probability_analysis&action=edit&redlink=1" class="new" title="Search probability analysis (page does not exist)">Search probability analysis</a> takes the loss data analysis further by determining the most probable target location. The search area box is partitioned into smaller areas called cells, each of which is assigned its own calculated probability of the target being in that cell. A map of these cells will indicate where the search should be concentrated to improve the chance of early location of the target in a large search area.<sup id="cite_ref-Salvage_manual_040_9-15" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Deep_water_search_patterns">Deep water search patterns</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=43" title="Edit section: Deep water search patterns"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The quality of a search pattern is measured by how thoroughly and efficiently the search area is examined. Systematic examination of the search area is achieved by following a planned pattern that is adapted to the particular conditions of the search.<sup id="cite_ref-Salvage_manual_040_9-16" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p>There are search patterns which have been found to be both effective and practical for deep ocean searches. An important general rule for side-scan sonar searches, regardless of what search pattern is used, is to orient the long dimension of the search area so that it is approximately parallel with the depth contours, which minimizes the need to make changes of the towfish altitude to maintain a reasonably consistent altitude (height above the bottom) and swath width, which results in more consistent sonar performance and a lower risk of omitted areas and excessive swath overlap. Signal degradation may occur on the down-slope side when running along contours, but is preferable to poor returns from the towfish as it is hauled up and down. Track spacing can be adapted to compensate.<sup id="cite_ref-Salvage_manual_040_9-17" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Parallel_grid_search">Parallel grid search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=44" title="Edit section: Parallel grid search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The most commonly used search pattern for a towed sensor search is a rectangular grid with straight-line search tracks parallel to each other. Adjacent search tracks are spaced close enough to allow the sonar coverage to overlap by enough to compensate for ship track and sonar tow path variations, and also compensate for the inherent loss in the sonar return and resolution at the outer edges and caused by depth variations.<sup id="cite_ref-Salvage_manual_040_9-18" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p>The ship must reverse heading and steady its course with the towfish aligned and at the correct depth at the end of each line and before re-entering the search area. A towfish will tend to change depth with a change in speed, and care must be taken that it does not hit the bottom during the turns. A straight run of several kilometers may be needed to get the towfish properly realigned in deep water work, so the time required for turns may exceed the time actually searching.<sup id="cite_ref-Salvage_manual_040_9-19" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Constant_range_search">Constant range search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=45" title="Edit section: Constant range search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Constant range searches are used if the vessel's navigation system does not have a capability for navigating along straight lines. This pattern uses search lines that are a constant distantce from a fixed reference point. When used for a side-scan sonar search, the range from the central point of the curves must be great enough to give a reasonably straight-line segment, as tracks that are not straight will degrade the side-scan sonar imagery and make interpretation much more difficult.<sup id="cite_ref-Salvage_manual_040_9-20" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> With ubiquitous <a href="/wiki/Global_navigation_satellite_systems" class="mw-redirect" title="Global navigation satellite systems">global navigation satellite systems</a> this method is mostly of historical interest. </p> <div class="mw-heading mw-heading4"><h4 id=""Z"_search"><span id=".22Z.22_search"></span>"Z" search</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=46" title="Edit section: "Z" search"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>"Z" search patterns are used specifically for the location of an undersea pipeline or cable, and can be very efficient in that they essentially cover the entire search area with slightly less detection probability than a parallel grid search, but without the need for 100-percent coverage and the typical overlap. The "Z" search makes use of the linear nature of pipelines and cables by ensuring that the towed sensor will cross the object several times at a reasonable angle for detection. If the object is detected with high confidence on the first few passes, the pattern can be modified such that the track lines will be shortened to just span the object and eventually follow it continuously within sensor range. The primary disadvantages of a "Z" search are that the object’s orientation must be known beforehand and that the actual moment of detection is short and can be missed. For this reason, it is recommended that both a side-scan sonar and magnetometer be used in tandem.<sup id="cite_ref-Salvage_manual_040_9-21" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Search_coverage">Search coverage</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=47" title="Edit section: Search coverage"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Search coverage is the area of seafloor effectively inspected by the sensors. Its area is the sensor effective swath width and the distance traveled by the search vessel on its track. It also relates to the repeat coverage of an area - one pass equals 100-percent coverage of an area and two passes over the same area equals 200 percent for that area. The quality of a search depends in part on how well the search area is examined. Occasionally a cursory search may find an object, but a thorough search should always be planned and the search area covered completely.<sup id="cite_ref-Salvage_manual_040_9-22" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p><b>Swath width</b> is the lateral coverage of the seafloor by the search sensor perpendicular to the track. It is based on the detection range for the target for the expected bottom terrain. Resolution of the sensor is inversely related to Swath width, particularly for side-scan sonar - the greater the swath width the lower the resolution.<sup id="cite_ref-Salvage_manual_040_9-23" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> Swath width is also a function of sensor height and bottom slope, and will vary depending on bottom profile. </p><p><b>Lane spacing</b> is the distance between two adjacent tracks in a grid search. The lane spacing must be less than the swath width of the sensor to allow for enough range overlap to assure complete coverage of the search area. The spacing between tracks along with the swath width determines the degree of coverage of the search area and ultimately the quality of the search. As lane spacing is decreased, the coverage and search quality increases because a greater percentage of seafloor is examined in two separate sensor passes. Closer lane spacing gives more thorough coverage, but increases the search time because more passes must be made through a given search area.<sup id="cite_ref-Salvage_manual_040_9-24" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p><b>Range overlap</b> is the area of seafloor that is examined twice on successive passes. It provides a margin of safety to mitigate ship track and sensor tow path variations and compensates for the inherent loss in the sonar signal quality at the outer ranges. The amount of range overlap required should be estimated before starting the search. A common range overlap for side-scan sonar is 50%, which is produced by using a lane spacing that of 50% of the swath width. The entire area of seafloor between the two outer tracks of the search box should be scanned twice in this scenario.<sup id="cite_ref-Salvage_manual_040_9-25" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p><b>Search time</b> is the time expended on the search, and is estimated during the planning. Only a rough approximation is possible, as the target may be found almost immediately, not at all, or after an intermediate duration affected by unforeseen circumstances. The basic information used for the calculation is the size of the area to be searched, the lane spacing to be used during the search, the approximate speed of the search vessel and an estimate of the end-of-line turn time, taking into account the water depth.<sup id="cite_ref-Salvage_manual_040_9-26" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p><b>Contact classification</b> is the process in which contacts from sensors are analyzed. Classification is a process of interpretation which depends on the distinctive characteristics target as the reference against which contacts are compared. It may be possible to identify a contact to be the lost object without the need for in-depth analysis, but in complex searches that involve many objects and numerous false contacts, the classification process can take days or weeks. Quantitative analysis that can be performed on side-scan and multibeam sonar contacts includes measuring the intensity of sonar signal returned by the contact, measuring the horizontal dimensions of the tar- get and the height of the contact off the seafloor. Precise position data of the contacts can also be useful in the interpretation of data. Qualitative analysis of a contact is the interpretation by the search specialist based on experience. The product of this analysis is a list of contacts ranked in priority for subsequent observation and identification.<sup id="cite_ref-Salvage_manual_040_9-27" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Search_platforms">Search platforms</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=48" title="Edit section: Search platforms"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Surface vessels can search with sensors mounted on the vessel or with towed transducers. Crewed submersibles, ROVs and AUVs can search using optical, sonar and <a href="/wiki/Magnetometer" title="Magnetometer">magnetometer</a> detection equipment.<sup id="cite_ref-Salvage_manual_040_9-28" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 1">: Ch. 1 </span></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Surface_vessels">Surface vessels</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=49" title="Edit section: Surface vessels"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Surface vessels can search underwater using sonar and magnetometer detection equipment.<sup id="cite_ref-BSAC_S&R_10-0" class="reference"><a href="#cite_note-BSAC_S&R-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Sakellariou_et_al_2007_11-0" class="reference"><a href="#cite_note-Sakellariou_et_al_2007-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Sometimes an optical search is also possible. Sensors and sensor arrays can be mounted on surface vessels, either in a fixed mounting, or on a mounting that is deployed when in use, and may be portable between vessels allowing convenient and economical use from vessels of opportunity. Some types of sensor, such as side-scan sonar and magnetometers are most useful if deployed fairly close to the bottom, so it is common to deploy them as <a href="/wiki/Towed_array_sonar" title="Towed array sonar">towed array sonar</a> systems on <a href="/wiki/Towfish" class="mw-redirect" title="Towfish">towfish</a>, towed behind a surface vessel, with the display and recording equipment on the towing vessel.<sup id="cite_ref-Salvage_manual_040_9-29" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>A <b>towed array sonar</b> is a system of <a href="/wiki/Hydrophone" title="Hydrophone">hydrophones</a> towed behind a ship by a cable.<sup id="cite_ref-Tichavský_and_Wong_12-0" class="reference"><a href="#cite_note-Tichavský_and_Wong-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> Trailing the hydrophones behind the vessel, on a cable that can be kilometers long, keeps the array's sensors away from the ship's own noise sources, greatly improving its <a href="/wiki/Signal-to-noise_ratio" title="Signal-to-noise ratio">signal-to-noise ratio</a>, and hence the effectiveness of detecting and tracking faint contacts, such as quiet, low noise-emitting submarine threats, or seismic signals.<sup id="cite_ref-Defence_Today_13-0" class="reference"><a href="#cite_note-Defence_Today-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p><p>A towed array offers superior resolution and range compared with hull mounted sonar. It also covers the <a href="/wiki/Baffles_(submarine)" title="Baffles (submarine)">baffles</a>, the blind spot of hull mounted sonar. However, effective use of the system limits a vessel's speed and care must be taken to protect the cable and array from damage. </p><p>Side-scan sonar imagery can be useful to identify objects which stand out from the surrounding topography. It is particularly useful in deep water and on smooth bottoms where the target is easily distinguished. It is less effective in areas where the target may be heavily encrusted with marine growth or otherwise hidden in the complexities of the bottom topography.<sup id="cite_ref-Ho_2017_14-0" class="reference"><a href="#cite_note-Ho_2017-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> Sonar produces a picture of the bottom by plotting the image derived from the time between emission of a sound signal from the transducer and the reception of an echo from a given direction. Resolution decreases with distance from the transducer, but at moderate range the form of a human body can be recognisable, making this a useful method for search and recovery operations. A transducer array mounted in a streamlined housing (known as the "fish" or "towfish") can be towed behind a vessel at a desired depth to provide suitable resolution. The image is recorded and the position of the fish relative to the vessel correlated with positional input from the vessel, usually from GPS. A search pattern which covers the whole search area with consistent relative position between transducer and tow vessel is most effective. Once a target has been found it is usually investigated further by a diver or ROV for positive identification and whatever other action is appropriate.<sup id="cite_ref-Salvage_manual_040_9-30" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>A magnetometer basically measures the magnetic field of the surroundings, and can detect very small local variations which may indicate the presence of magnetic materials. When a magnetometer is towed behind a vessel at a distance where the magnetic field of the towing vehicle does not overwhelm the signal, it can be a sensitive indicator of variations due to geological deposits or artifacts. The signal is correlated to position input, usually from GPS, to indicate local magnetic anomalies which may be worth further investigation by diver or ROV. Towed magnetometer searches are useful for finding artifacts such as shipwrecks and aircraft wrecks,<sup id="cite_ref-Ho_2017_14-1" class="reference"><a href="#cite_note-Ho_2017-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> and can also be useful for confirming detection of pipelines and cables when towed in series with a side-scan sonar.<sup id="cite_ref-Salvage_manual_040_9-31" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Crewed_submersibles">Crewed submersibles</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=50" title="Edit section: Crewed submersibles"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Submersible" title="Submersible">Submersible</a></div> <p>Crewed submersibles often have search sensors mounted as part of their basic outfit, as searches are a common task, and the same sensors are often also used for underwater navigation. </p> <div class="mw-heading mw-heading3"><h3 id="Remotely_operated_underwater_vehicles">Remotely operated underwater vehicles</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=51" title="Edit section: Remotely operated underwater vehicles"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Remotely_operated_underwater_vehicle" title="Remotely operated underwater vehicle">Remotely operated underwater vehicle</a></div> <p>An ROV can be used as a platform for sensors which can maneuver the sensors in proximity to objects of interest on the bottom. Its value as a search tool depends on how effectively and efficiently it can be used to cover a search area compared to towed or surface vessel mounted systems. An ROV is limited to operating in small areas because of the restriction of the umbilical on maneuverability and range, but it can be very effective in searching a debris field for specific items. Onboard acoustic and optical sensors can be used to locate and identify objects, and manipulators may be useful for recovering objects within its carrying capacity.<sup id="cite_ref-Salvage_manual_040_9-32" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p><p>An ROV box search is unique to ROV operations. The intention is that the ROV will completely search a square area of seafloor and then move on to search an adjacent square area of the same dimensions. Through successive searching of adjacent boxes arranged in a grid, the ROV can systematically cover a search area with reasonable expectations of full coverage. ROV box searches are designed around the effective range of the ROV's scanning sonar and the scope of free movement available to the ROV by way of its tether. The search begins by deploying the ROV in the center of the box while the support ship keeps station over the box center. Guided by the sonar contacts it picks up, the ROV follows radial lines from the center of the box to locate and visually inspect each contact.<sup id="cite_ref-Salvage_manual_040_9-33" class="reference"><a href="#cite_note-Salvage_manual_040-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: Ch. 2">: Ch. 2 </span></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Autonomous_underwater_vehicles">Autonomous underwater vehicles</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=52" title="Edit section: Autonomous underwater vehicles"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Autonomous_underwater_vehicle" title="Autonomous underwater vehicle">Autonomous underwater vehicle</a></div> <p>An autonomous underwater vehicle (AUV) is a <a href="/wiki/Robot" title="Robot">robotic</a> submersible that travels underwater without requiring continuous input from an operator. AUVs constitute part of a larger group of undersea systems known as <a href="/wiki/Unmanned_underwater_vehicle" title="Unmanned underwater vehicle">unmanned underwater vehicles</a>, a classification that includes non-autonomous <a href="/wiki/Remotely_operated_underwater_vehicle" title="Remotely operated underwater vehicle">remotely operated underwater vehicles</a> (ROVs) – controlled and powered from the surface by an operator/pilot via an umbilical or using remote control. </p><p>For example, the US Navy's <a href="/wiki/Advanced_Unmanned_Search_System" title="Advanced Unmanned Search System">Advanced Unmanned Search System</a> (AUSS) was capable of deep ocean, large area <a href="/wiki/Side-scan_sonar" title="Side-scan sonar">side-scan sonar</a> search and detailed optical inspection, after which it could resume the search where it left off. It used <a href="/w/index.php?title=Doppler_sonar&action=edit&redlink=1" class="new" title="Doppler sonar (page does not exist)">Doppler sonar</a> and a <a href="/wiki/Gyrocompass" title="Gyrocompass">gyrocompass</a> to navigate, and could operate to 6,000 metres (20,000 ft) depth.<sup id="cite_ref-AUSS_15-0" class="reference"><a href="#cite_note-AUSS-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p><p>The AUSS used several sensor systems for deep water search and inspection. These included the acoustic link, Doppler sonar, scanning sonar and optical sensors, and computers and software for data processing. AUSS could do broad area searches and immediate target evaluation interchangeably, and could provide near-real-time high-resolution sonar data at speeds up to five knots. The vehicle could be instructed to take still images from specific locations, or to provide a photo-mosaic of a specified size, orientation, and location. The vehicle could do a purely optical search or use scanning sonar as the primary search sensor. These capabilities allowed a wide and versatile range of search strategies.<sup id="cite_ref-Ulrich_and_Watson_1992_16-0" class="reference"><a href="#cite_note-Ulrich_and_Watson_1992-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Aircraft">Aircraft</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=53" title="Edit section: Aircraft"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Crewed <a href="/wiki/Aircraft" title="Aircraft">aircraft</a> and <a href="/wiki/Unmanned_aerial_vehicle" title="Unmanned aerial vehicle">drones</a> can be used for visual and <a href="/wiki/Lidar" title="Lidar">lidar</a> searches in good visibility and shallow water, and for magnetometer searches. </p><p>Active and passive <a href="/wiki/Sonobuoys" class="mw-redirect" title="Sonobuoys">sonobuoys</a> may be used to search for and locate the position of a submerged submarine. </p><p>They may be anchored in shallow water, or free-floating in deep water. and may be part of a long term early-warning system, or actively used to hunt down enemy vessels. The position of the target is identified by analysing the time difference of the same sound signals either emitted or reflected from the target and received by three or more buoys. The buoys may be deployed by conventional aircraft or helicopter, or by ships.<sup id="cite_ref-Wahlstedt_et_al_1997_17-0" class="reference"><a href="#cite_note-Wahlstedt_et_al_1997-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p><p>Air searches can be done for magnetic targets using magnetic anomaly detection (MAD) systems, which use a sensitive magnetometer carried by an aircraft. These can be done for static targets following search patterns similar to those used by surface craft, or for moving targets such as submarines by search patterns optimised to improve the probability of identifying the position of a moving target. MAD detection of submarines is used to track down the current position of a submarine known to be in the area for purposes of identification, confirmation of suspected presence, tracking of movements and launching of weaponry.<sup id="cite_ref-Haley_2012_18-0" class="reference"><a href="#cite_note-Haley_2012-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="From_the_shore">From the shore</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=54" title="Edit section: From the shore"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Draglines have been used from the shore to locate suitable targets. Lines with hooks or grapnels may be thrown or carried out from the shore and then pulled in with the hope of snagging the target, Once snagged, the procedure depends on whether the target is likely to be pulled out, or must be inspected in situ.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (June 2017)">citation needed</span></a></i>]</sup> </p><p><a href="/wiki/Cadaver_dogs" class="mw-redirect" title="Cadaver dogs">Cadaver dogs</a> are used by law enforcement and public safety agencies to detect missing bodies underwater. This is most effective in shallow and confined water without much current. The dogs can also be transported over the water in boats to expand the search area or attempt to provide more precise location.<sup id="cite_ref-BBC2014_19-0" class="reference"><a href="#cite_note-BBC2014-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> The dogs are most effective when they can get right down to the water surface to smell and taste it, which requires a boat with low freeboard.<sup id="cite_ref-Forensicmag_2015_20-0" class="reference"><a href="#cite_note-Forensicmag_2015-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> Dog searches for underwater cadavers is complicated by the movement of water and wind, which move the smell away from the source.<sup id="cite_ref-Huddersfield_2015_21-0" class="reference"><a href="#cite_note-Huddersfield_2015-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=55" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Diver_rescue" title="Diver rescue">Diver rescue</a> – Rescue of a distressed or incapacitated diver</li> <li><a href="/wiki/Emergency_management" title="Emergency management">Emergency management</a> – Dealing with all humanitarian aspects of emergencies</li> <li><a href="/wiki/Frisking" title="Frisking">Frisking</a>, also known as body search – Act of searching a person's outer clothing to detect concealed objects</li> <li><a href="/wiki/Marine_salvage" title="Marine salvage">Marine salvage</a> – Recovering a ship or cargo after a maritime casualty</li> <li><a href="/wiki/Police_diving" title="Police diving">Police diving</a> – A branch of professional diving carried out by police services</li> <li><a href="/wiki/Search_and_rescue" title="Search and rescue">Search and rescue</a> – Search for and provision of aid to people who are in distress or imminent danger <ul><li><a href="/wiki/Air-sea_rescue" title="Air-sea rescue">Air-sea rescue</a> – Coordinated search and rescue of survivors at sea</li> <li><a href="/wiki/Combat_search_and_rescue" title="Combat search and rescue">Combat search and rescue</a> – Military personnel recovery from battlefield and enemy occupied areas</li> <li><a href="/wiki/Surface_water_rescue" title="Surface water rescue">Surface water rescue</a> – Rescue of a person who is at the surface of a body of water.</li> <li><a href="/wiki/Surface_water_searches" class="mw-redirect" title="Surface water searches">Surface water searches</a> – Procedures to find objects or persons lost at the surface of a body of water</li> <li><a href="/wiki/Technical_rescue" title="Technical rescue">Technical rescue</a> – Use of specialised tools and skills for rescue</li> <li><a href="/wiki/Wilderness_search_and_rescue" class="mw-redirect" title="Wilderness search and rescue">Wilderness search and rescue</a> – Techniques applicable to wild areas</li></ul></li> <li><a href="/wiki/Search_and_seizure" title="Search and seizure">Search and seizure</a> – Police powers</li> <li><a href="/wiki/Underwater_search_and_recovery" title="Underwater search and recovery">Underwater search and recovery</a> – Locating and recovering underwater objects</li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Underwater_searches&action=edit&section=56" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-BSAC_Sport_Diving_1985-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-BSAC_Sport_Diving_1985_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-BSAC_Sport_Diving_1985_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-BSAC_Sport_Diving_1985_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-BSAC_Sport_Diving_1985_1-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-BSAC_Sport_Diving_1985_1-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-BSAC_Sport_Diving_1985_1-5"><sup><i><b>f</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFBusuttiliHolbrookRidleyTodd1985" class="citation book cs1">Busuttili, Mike; Holbrook, Mike; Ridley, Gordon; Todd, Mike, eds. (1985). "Using basic equipment". <i>Sport diving – The British Sub-Aqua Club Diving Manual</i>. London: Stanley Paul & Co Ltd. p. 58. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-09-163831-3" title="Special:BookSources/0-09-163831-3"><bdi>0-09-163831-3</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Using+basic+equipment&rft.btitle=Sport+diving+%E2%80%93+The+British+Sub-Aqua+Club+Diving+Manual&rft.place=London&rft.pages=58&rft.pub=Stanley+Paul+%26+Co+Ltd&rft.date=1985&rft.isbn=0-09-163831-3&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUnderwater+searches" class="Z3988"></span></span> </li> <li id="cite_note-NOAA-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-NOAA_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-NOAA_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNOAA_Diving_Manual2001" class="citation book cs1">NOAA Diving Program (U.S.) (28 Feb 2001). Joiner, James T. (ed.). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/noaadivingmanual00noaa"><i>NOAA Diving Manual, Diving for Science and Technology</i></a></span> (4th ed.). Silver Spring, Maryland: National Oceanic and Atmospheric Administration, Office of Oceanic and Atmospheric Research, National Undersea Research Program. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-941332-70-5" title="Special:BookSources/978-0-941332-70-5"><bdi>978-0-941332-70-5</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=NOAA+Diving+Manual%2C+Diving+for+Science+and+Technology&rft.place=Silver+Spring%2C+Maryland&rft.edition=4th&rft.pub=National+Oceanic+and+Atmospheric+Administration%2C+Office+of+Oceanic+and+Atmospheric+Research%2C+National+Undersea+Research+Program&rft.date=2001-02-28&rft.isbn=978-0-941332-70-5&rft.au=NOAA+Diving+Program+%28U.S.%29&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fnoaadivingmanual00noaa&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUnderwater+searches" class="Z3988"></span> CD-ROM prepared and distributed by the National Technical Information Service (NTIS)in partnership with NOAA and Best Publishing Company</span> </li> <li id="cite_note-CDM-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-CDM_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-CDM_3-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-CDM_3-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-CDM_3-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-CDM_3-4"><sup><i><b>e</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLarnWhistler1993" class="citation book cs1">Larn, Richard; Whistler, Rex (1993). <i>Commercial Diving Manual</i> (3rd ed.). Newton Abbott, UK: David and Charles. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-7153-0100-4" title="Special:BookSources/0-7153-0100-4"><bdi>0-7153-0100-4</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Commercial+Diving+Manual&rft.place=Newton+Abbott%2C+UK&rft.edition=3rd&rft.pub=David+and+Charles&rft.date=1993&rft.isbn=0-7153-0100-4&rft.aulast=Larn&rft.aufirst=Richard&rft.au=Whistler%2C+Rex&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUnderwater+searches" class="Z3988"></span></span> </li> <li id="cite_note-Hanekom_and_Truter_2007-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-Hanekom_and_Truter_2007_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-5"><sup><i><b>f</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-6"><sup><i><b>g</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-7"><sup><i><b>h</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-8"><sup><i><b>i</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-9"><sup><i><b>j</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-10"><sup><i><b>k</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-11"><sup><i><b>l</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-12"><sup><i><b>m</b></i></sup></a> <a href="#cite_ref-Hanekom_and_Truter_2007_4-13"><sup><i><b>n</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHanekomTruter2007" class="citation book cs1">Hanekom, Paul; Truter, Pieter (February 2007). "Section 17: Seabed searches". <i>Diver Training Handbook</i> (3rd ed.). Cape Town, South Africa: Research Diving Unit, University of Cape Town.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Section+17%3A+Seabed+searches&rft.btitle=Diver+Training+Handbook&rft.place=Cape+Town%2C+South+Africa&rft.edition=3rd&rft.pub=Research+Diving+Unit%2C+University+of+Cape+Town&rft.date=2007-02&rft.aulast=Hanekom&rft.aufirst=Paul&rft.au=Truter%2C+Pieter&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUnderwater+searches" class="Z3988"></span></span> </li> <li id="cite_note-Line_drills-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-Line_drills_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Line_drills_5-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Line_drills_5-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Line_drills_5-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.cavediveflorida.com/Line_Drills.htm">"Line drills"</a>. <i>www.cavediveflorida.com</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20221127050736/http://www.cavediveflorida.com/Line_Drills.htm">Archived</a> from the original on 27 November 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">18 June</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.cavediveflorida.com&rft.atitle=Line+drills&rft_id=http%3A%2F%2Fwww.cavediveflorida.com%2FLine_Drills.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUnderwater+searches" class="Z3988"></span></span> </li> <li id="cite_note-Azul-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-Azul_6-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://azulunlimited.com/4-helpful-scuba-search-patterns-for-divers/">"4 helpful scuba Search Patterns for divers"</a>. <i>azulunlimited.com</i><span class="reference-accessdate">. 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(2012). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=7PblBwAAQBAJ&q=aircraft+magnetometer+search&pg=PA127">"Computer simulation of search tactics for magnetic anomaly detection"</a>. In Haley, K. (ed.). <i>Search Theory and Applications</i>. Nato Conference Series II: Systems Science. Vol. 8 (illustrated ed.). Springer Science & Business Media. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9781461591887" title="Special:BookSources/9781461591887"><bdi>9781461591887</bdi></a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20230306095520/https://books.google.com/books?id=7PblBwAAQBAJ&q=aircraft+magnetometer+search&pg=PA127">Archived</a> from the original on 2023-03-06<span class="reference-accessdate">. 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Retrieved <span class="nowrap">11 September</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.forensicmag.com&rft.atitle=Cadaver+Dogs+Locate+Underwater+Corpses&rft.date=2015-09-16&rft.au=University+of+Huddersfield+staff&rft_id=https%3A%2F%2Fwww.forensicmag.com%2Fnews%2F2015%2F09%2Fcadaver-dogs-locate-underwater-corpses&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUnderwater+searches" class="Z3988"></span></span> </li> <li id="cite_note-Huddersfield_2015-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-Huddersfield_2015_21-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www-old.hud.ac.uk/news/2015/september/researchshowsvalueofcadaverdogslocatingunderwatercorpses.php">"Research shows value of cadaver dogs locating underwater corpses"</a>. <i>University of Huddersfield News</i>. 10 September 2015. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170911204626/http://www-old.hud.ac.uk/news/2015/september/researchshowsvalueofcadaverdogslocatingunderwatercorpses.php">Archived</a> from the original on 11 September 2017<span class="reference-accessdate">. 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id="Diving_equipment" style="font-size:114%;margin:0 4em"><a href="/wiki/Diving_equipment" title="Diving equipment">Diving equipment</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cleaning_and_disinfection_of_personal_diving_equipment" title="Cleaning and disinfection of personal diving equipment">Cleaning and disinfection of personal diving equipment</a></li> <li><a href="/wiki/Human_factors_in_diving_equipment_design" title="Human factors in diving equipment design">Human factors in diving equipment design</a></li> <li><a href="/wiki/List_of_diving_equipment_manufacturers" title="List of diving equipment manufacturers">List of diving equipment manufacturers</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Basic equipment</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diving_mask" title="Diving mask">Diving mask</a></li> <li><a href="/wiki/Snorkel_(swimming)" title="Snorkel (swimming)">Snorkel</a></li> <li><a href="/wiki/Swimfin" title="Swimfin">Swimfin</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Breathing_gas" title="Breathing gas">Breathing gas</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bailout_gas" class="mw-redirect" title="Bailout gas">Bailout gas</a></li> <li><a href="/wiki/Bottom_gas" class="mw-redirect" title="Bottom gas">Bottom gas</a></li> <li><a href="/wiki/Breathing_air" class="mw-redirect" title="Breathing air">Breathing air</a></li> <li><a href="/wiki/Decompression_gas" class="mw-redirect" title="Decompression gas">Decompression gas</a></li> <li><a href="/wiki/Emergency_gas_supply" class="mw-redirect" title="Emergency gas supply">Emergency gas supply</a></li> <li><a href="/wiki/Heliox" title="Heliox">Heliox</a></li> <li><a href="/wiki/Hydreliox" title="Hydreliox">Hydreliox</a></li> <li><a href="/wiki/Hydrox_(breathing_gas)" title="Hydrox (breathing gas)">Hydrox</a></li> <li><a href="/wiki/Nitrox" title="Nitrox">Nitrox</a></li> <li><a href="/wiki/Oxygen" title="Oxygen">Oxygen</a></li> <li><a href="/wiki/Travel_gas" class="mw-redirect" title="Travel gas">Travel gas</a></li> <li><a href="/wiki/Trimix_(breathing_gas)" title="Trimix (breathing gas)">Trimix</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Buoyancy and<br />trim equipment</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Avelo_diving_system" title="Avelo diving system">Avelo diving system</a></li> <li><a href="/wiki/Buoyancy_compensator_(diving)" title="Buoyancy compensator (diving)">Buoyancy compensator</a> <ul><li><a href="/wiki/Power_inflator" class="mw-redirect" title="Power inflator">Power inflator</a></li> <li><a href="/wiki/Dump_valve_(diving)" class="mw-redirect" title="Dump valve (diving)">Dump valve</a></li> <li><a href="/wiki/Variable_buoyancy_pressure_vessel" class="mw-redirect" title="Variable buoyancy pressure vessel">Variable buoyancy pressure vessel</a></li></ul></li> <li><a href="/wiki/Diving_weighting_system" title="Diving weighting system">Diving weighting system</a> <ul><li><a href="/wiki/Ankle_weights_(diving)" class="mw-redirect" title="Ankle weights (diving)">Ankle weights</a></li> <li><a href="/wiki/Integrated_weights" class="mw-redirect" title="Integrated weights">Integrated weights</a></li> <li><a href="/wiki/Trim_weights_(diving)" class="mw-redirect" title="Trim weights (diving)">Trim weights</a></li> <li><a href="/wiki/Weight_belt" class="mw-redirect" title="Weight belt">Weight belt</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Decompression_equipment" title="Decompression equipment">Decompression<br />equipment</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Decompression_buoy" class="mw-redirect" title="Decompression buoy">Decompression buoy</a></li> <li><a href="/wiki/Decompression_chamber" class="mw-redirect" title="Decompression chamber">Decompression chamber</a></li> <li><a href="/wiki/Decompression_cylinder" class="mw-redirect" title="Decompression cylinder">Decompression cylinder</a></li> <li><a href="/wiki/Decompression_trapeze" class="mw-redirect" title="Decompression trapeze">Decompression trapeze</a></li> <li><a href="/wiki/Dive_computer" title="Dive computer">Dive computer</a></li> <li><a href="/wiki/Diving_bell" title="Diving bell">Diving bell</a></li> <li><a href="/wiki/Diving_shot" title="Diving shot">Diving shot</a></li> <li><a href="/wiki/Diving_stage" class="mw-redirect" title="Diving stage">Diving stage</a></li> <li><a href="/wiki/Jersey_upline" class="mw-redirect" title="Jersey upline">Jersey upline</a></li> <li><a href="/wiki/Jonline" class="mw-redirect" title="Jonline">Jonline</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diving_suit" title="Diving suit">Diving suit</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Atmospheric_diving_suit" title="Atmospheric diving suit">Atmospheric diving suit</a> <ul><li><a href="/wiki/JIM_suit" title="JIM suit">JIM suit</a></li> <li><a href="/wiki/Newtsuit" title="Newtsuit">Newtsuit</a></li></ul></li> <li><a href="/wiki/Dry_suit" title="Dry suit">Dry suit</a> <ul><li><a href="/wiki/Sladen_suit" class="mw-redirect" title="Sladen suit">Sladen suit</a></li> <li><a href="/wiki/Standard_diving_suit" class="mw-redirect" title="Standard diving suit">Standard diving suit</a></li></ul></li> <li><a href="/wiki/Rash_vest" class="mw-redirect" title="Rash vest">Rash vest</a></li> <li><a href="/wiki/Wetsuit" title="Wetsuit">Wetsuit</a> <ul><li><a href="/wiki/Dive_skins" class="mw-redirect" title="Dive skins">Dive skins</a></li> <li><a href="/wiki/Hot-water_suit" class="mw-redirect" title="Hot-water suit">Hot-water suit</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Helmets<br />and masks</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Anti-fog" title="Anti-fog">Anti-fog</a></li> <li><a href="/wiki/Diving_helmet" title="Diving helmet">Diving helmet</a> <ul><li><a href="/wiki/Free-flow_helmet" class="mw-redirect" title="Free-flow helmet">Free-flow helmet</a></li> <li><a href="/wiki/Lightweight_demand_helmet" class="mw-redirect" title="Lightweight demand helmet">Lightweight demand helmet</a></li> <li><a href="/wiki/Orinasal_mask" title="Orinasal mask">Orinasal mask</a></li> <li><a href="/wiki/Reclaim_helmet" class="mw-redirect" title="Reclaim helmet">Reclaim helmet</a></li> <li><a href="/wiki/Shallow_water_helmet" class="mw-redirect" title="Shallow water helmet">Shallow water helmet</a></li> <li><a href="/wiki/Standard_diving_helmet" class="mw-redirect" title="Standard diving helmet">Standard diving helmet</a></li></ul></li> <li><a href="/wiki/Diving_mask" title="Diving mask">Diving mask</a> <ul><li><a href="/wiki/Band_mask" class="mw-redirect" title="Band mask">Band mask</a></li> <li><a href="/wiki/Full-face_mask" class="mw-redirect" title="Full-face mask">Full-face mask</a></li> <li><a href="/wiki/Half_mask" class="mw-redirect" title="Half mask">Half mask</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Instrumentation</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bottom_timer" class="mw-redirect" title="Bottom timer">Bottom timer</a></li> <li><a href="/wiki/Depth_gauge" title="Depth gauge">Depth gauge</a></li> <li><a href="/wiki/Dive_computer" title="Dive computer">Dive computer</a></li> <li><a href="/wiki/Dive_timer" class="mw-redirect" title="Dive timer">Dive timer</a></li> <li><a href="/wiki/Diving_watch" title="Diving watch">Diving watch</a> <ul><li><a href="/wiki/Helium_release_valve" title="Helium release valve">Helium release valve</a></li></ul></li> <li><a href="/wiki/Electro-galvanic_oxygen_sensor" title="Electro-galvanic oxygen sensor">Electro-galvanic oxygen sensor</a></li> <li><a href="/wiki/Pneumofathometer" class="mw-redirect" title="Pneumofathometer">Pneumofathometer</a></li> <li><a href="/wiki/Submersible_pressure_gauge" class="mw-redirect" title="Submersible pressure gauge">Submersible pressure gauge</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Mobility<br />equipment</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diver_propulsion_vehicle" title="Diver propulsion vehicle">Diver propulsion vehicle</a></li> <li><a href="/wiki/Diving_bell" title="Diving bell">Diving bell</a> <ul><li><a href="/wiki/Closed_bell" class="mw-redirect" title="Closed bell">Closed bell</a></li> <li><a href="/wiki/Wet_bell" class="mw-redirect" title="Wet bell">Wet bell</a></li></ul></li> <li><a href="/wiki/Diving_stage" class="mw-redirect" title="Diving stage">Diving stage</a></li> <li><a href="/wiki/Swimfin" title="Swimfin">Swimfin</a> <ul><li><a href="/wiki/Monofin" title="Monofin">Monofin</a></li> <li><a href="/wiki/PowerSwim" title="PowerSwim">PowerSwim</a></li></ul></li> <li><a href="/wiki/Towboard" title="Towboard">Towboard</a></li> <li><a href="/wiki/Wet_sub" title="Wet sub">Wet sub</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Safety<br />equipment</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alternative_air_source" title="Alternative air source">Alternative air source</a> <ul><li><a href="/wiki/Octopus_regulator" class="mw-redirect" title="Octopus regulator">Octopus regulator</a></li> <li><a href="/wiki/Pony_bottle" title="Pony bottle">Pony bottle</a></li></ul></li> <li><a href="/wiki/Bolt_snap" title="Bolt snap">Bolt snap</a></li> <li><a href="/wiki/Buddy_line" class="mw-redirect" title="Buddy line">Buddy line</a></li> <li><a href="/wiki/Dive_light" title="Dive light">Dive light</a></li> <li><a href="/wiki/Diver%27s_cutting_tool" class="mw-redirect" title="Diver's cutting tool">Diver's cutting tool</a> <ul><li><a href="/wiki/Diver%27s_knife" class="mw-redirect" title="Diver's knife">Diver's knife</a></li></ul></li> <li><a href="/wiki/Diver%27s_telephone" class="mw-redirect" title="Diver's telephone">Diver's telephone</a></li> <li><a href="/wiki/Through-water_communications" class="mw-redirect" title="Through-water communications">Through-water communications</a> <ul><li><a href="/wiki/Underwater_acoustic_communication" title="Underwater acoustic communication">Underwater acoustic communication</a></li></ul></li> <li><a href="/wiki/Diving_bell" title="Diving bell">Diving bell</a></li> <li><a href="/wiki/Diving_safety_harness" class="mw-redirect" title="Diving safety harness">Diving safety harness</a></li> <li><a href="/wiki/Emergency_gas_supply" class="mw-redirect" title="Emergency gas supply">Emergency gas supply</a> <ul><li><a href="/wiki/Bailout_block" class="mw-redirect" title="Bailout block">Bailout block</a></li> <li><a href="/wiki/Bailout_bottle" title="Bailout bottle">Bailout bottle</a></li></ul></li> <li><a href="/wiki/Lifeline_(diving)" class="mw-redirect" title="Lifeline (diving)">Lifeline</a> <ul><li><a href="/wiki/Screw_gate_carabiner" class="mw-redirect" title="Screw gate carabiner">Screw gate carabiner</a></li></ul></li> <li><a href="/wiki/Emergency_locator_beacon" title="Emergency locator beacon">Emergency locator beacon</a></li> <li><a href="/wiki/Rescue_tether" class="mw-redirect" title="Rescue tether">Rescue tether</a></li> <li><a href="/wiki/Safety_helmet" class="mw-redirect" title="Safety helmet">Safety helmet</a></li> <li><a href="/wiki/Shark-proof_cage" class="mw-redirect" title="Shark-proof cage">Shark-proof cage</a></li> <li><a href="/wiki/Snoopy_loop" class="mw-redirect" title="Snoopy loop">Snoopy loop</a></li> <li>Navigation equipment <ul><li><a href="/wiki/Distance_line" title="Distance line">Distance line</a></li> <li><a href="/wiki/Diving_compass" class="mw-redirect" title="Diving compass">Diving compass</a></li> <li><a href="/wiki/Dive_reel" class="mw-redirect" title="Dive reel">Dive reel</a></li> <li><a href="/wiki/Line_marker" title="Line marker">Line marker</a></li> <li><a href="/wiki/Surface_marker_buoy" title="Surface marker buoy">Surface marker buoy</a></li> <li><a href="/wiki/Silt_screw" class="mw-redirect" title="Silt screw">Silt screw</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Underwater_breathing_apparatus" title="Underwater breathing apparatus">Underwater<br />breathing<br />apparatus</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Atmospheric_diving_suit" title="Atmospheric diving suit">Atmospheric diving suit</a></li> <li><a href="/wiki/Diving_cylinder" title="Diving cylinder">Diving cylinder</a> <ul><li><a href="/wiki/Burst_disc" class="mw-redirect" title="Burst disc">Burst disc</a></li> <li><a href="/wiki/Scuba_cylinder_valve" title="Scuba cylinder valve">Scuba cylinder valve</a></li></ul></li> <li><a href="/wiki/Diving_helmet" title="Diving helmet">Diving helmet</a> <ul><li><a href="/wiki/Reclaim_helmet" class="mw-redirect" title="Reclaim helmet">Reclaim helmet</a></li></ul></li> <li><a href="/wiki/Diving_regulator" title="Diving regulator">Diving regulator</a> <ul><li><a href="/wiki/Mechanism_of_diving_regulators" title="Mechanism of diving regulators">Mechanism of diving regulators</a></li> <li><a href="/wiki/Regulator_malfunction" class="mw-redirect" title="Regulator malfunction">Regulator malfunction</a> <ul><li><a href="/wiki/Regulator_freeze" class="mw-redirect" title="Regulator freeze">Regulator freeze</a></li></ul></li> <li><a href="/wiki/Single-hose_regulator" class="mw-redirect" title="Single-hose regulator">Single-hose regulator</a></li> <li><a href="/wiki/Twin-hose_regulator" class="mw-redirect" title="Twin-hose regulator">Twin-hose regulator</a></li></ul></li> <li><a href="/wiki/Full-face_diving_mask" title="Full-face diving mask">Full-face diving mask</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Open-circuit_scuba" class="mw-redirect" title="Open-circuit scuba">Open-circuit<br />scuba</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Scuba_set" title="Scuba set">Scuba set</a> <ul><li><a href="/wiki/Bailout_bottle" title="Bailout bottle">Bailout bottle</a></li> <li><a href="/wiki/Decompression_cylinder" class="mw-redirect" title="Decompression cylinder">Decompression cylinder</a></li> <li><a href="/wiki/Independent_doubles" class="mw-redirect" title="Independent doubles">Independent doubles</a></li> <li><a href="/wiki/Manifolded_twin_set" class="mw-redirect" title="Manifolded twin set">Manifolded twin set</a> <ul><li><a href="/wiki/Scuba_manifold" title="Scuba manifold">Scuba manifold</a></li></ul></li> <li><a href="/wiki/Pony_bottle" title="Pony bottle">Pony bottle</a></li> <li><a href="/wiki/Scuba_configuration" class="mw-redirect" title="Scuba configuration">Scuba configuration</a></li> <li><a href="/wiki/Sidemount" class="mw-redirect" title="Sidemount">Sidemount</a></li> <li><a href="/wiki/Sling_cylinder" class="mw-redirect" title="Sling cylinder">Sling cylinder</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diving_rebreather" title="Diving rebreather">Diving rebreathers</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Carbon_dioxide_scrubber" title="Carbon dioxide scrubber">Carbon dioxide scrubber</a></li> <li><a href="/wiki/Carleton_CDBA" class="mw-redirect" title="Carleton CDBA">Carleton CDBA</a></li> <li><a href="/wiki/Clearance_Divers_Life_Support_Equipment" title="Clearance Divers Life Support Equipment">Clearance Divers Life Support Equipment</a></li> <li><a href="/wiki/Cryogenic_rebreather" class="mw-redirect" title="Cryogenic rebreather">Cryogenic rebreather</a></li> <li><a href="/wiki/CUMA" title="CUMA">CUMA</a></li> <li><a href="/wiki/DSEA" class="mw-redirect" title="DSEA">DSEA</a></li> <li><a href="/wiki/Dr%C3%A4ger_Dolphin" class="mw-redirect" title="Dräger Dolphin">Dolphin</a></li> <li><a href="/wiki/Halcyon_PVR-BASC" title="Halcyon PVR-BASC">Halcyon PVR-BASC</a></li> <li><a href="/wiki/Halcyon_RB80" title="Halcyon RB80">Halcyon RB80</a></li> <li><a href="/wiki/IDA71" title="IDA71">IDA71</a></li> <li><a href="/wiki/Interspiro_DCSC" title="Interspiro DCSC">Interspiro DCSC</a></li> <li><a href="/wiki/LAR-5" class="mw-redirect" title="LAR-5">LAR-5</a></li> <li><a href="/wiki/LAR-6" class="mw-redirect" title="LAR-6">LAR-6</a></li> <li><a href="/wiki/LAR-V" class="mw-redirect" title="LAR-V">LAR-V</a></li> <li><a href="/wiki/Lambertsen_Amphibious_Respiratory_Unit" title="Lambertsen Amphibious Respiratory Unit">LARU</a></li> <li><a href="/wiki/Mark_IV_Amphibian" title="Mark IV Amphibian">Mark IV Amphibian</a></li> <li><a href="/wiki/Porpoise_(scuba_gear)" title="Porpoise (scuba gear)">Porpoise</a></li> <li><a href="/wiki/Dr%C3%A4ger_Ray" class="mw-redirect" title="Dräger Ray">Ray</a></li> <li><a href="/wiki/Siebe_Gorman_CDBA" title="Siebe Gorman CDBA">Siebe Gorman CDBA</a></li> <li><a href="/wiki/Siebe_Gorman_Salvus" title="Siebe Gorman Salvus">Salvus</a></li> <li><a href="/wiki/Siva_(rebreather)" class="mw-redirect" title="Siva (rebreather)">Siva</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Surface-supplied_diving_equipment" title="Surface-supplied diving equipment">Surface-supplied<br />diving equipment</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Air_line" title="Air line">Air line</a></li> <li><a href="/wiki/Diver%27s_umbilical" class="mw-redirect" title="Diver's umbilical">Diver's umbilical</a></li> <li><a href="/wiki/Diving_air_compressor" title="Diving air compressor">Diving air compressor</a></li> <li><a href="/wiki/Gas_panel" class="mw-redirect" title="Gas panel">Gas panel</a></li> <li><a href="/wiki/Hookah_(diving)" class="mw-redirect" title="Hookah (diving)">Hookah</a></li> <li><a href="/wiki/Scuba_replacement" class="mw-redirect" title="Scuba replacement">Scuba replacement</a></li> <li><a href="/wiki/Snuba" title="Snuba">Snuba</a></li> <li><a href="/wiki/Standard_diving_dress" title="Standard diving dress">Standard diving dress</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_diving_equipment_manufacturers" title="List of diving equipment manufacturers"> Diving<br />equipment<br />manufacturers</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/AP_Diving" title="AP Diving">AP Diving</a></li> <li><a href="/wiki/Apeks" title="Apeks">Apeks</a></li> <li><a href="/wiki/Aqua_Lung_America" title="Aqua Lung America">Aqua Lung America</a></li> <li><a href="/wiki/Aqua_Lung/La_Spirotechnique" title="Aqua Lung/La Spirotechnique">Aqua Lung/La Spirotechnique</a></li> <li><a href="/wiki/Beuchat" title="Beuchat">Beuchat</a></li> <li><a href="/wiki/Ren%C3%A9_Cavalero" title="René Cavalero">René Cavalero</a></li> <li><a href="/wiki/Cis-Lunar" title="Cis-Lunar">Cis-Lunar</a></li> <li><a href="/wiki/Cressi-Sub" title="Cressi-Sub">Cressi-Sub</a></li> <li><a href="/wiki/Dacor_(scuba_diving)" title="Dacor (scuba diving)">Dacor</a></li> <li><a href="/wiki/DESCO" title="DESCO">DESCO</a></li> <li><a href="/wiki/Dive_Xtras" title="Dive Xtras">Dive Xtras</a></li> <li><a href="/wiki/Divex" title="Divex">Divex</a></li> <li><a href="/wiki/Diving_Unlimited_International" title="Diving Unlimited International">Diving Unlimited International</a></li> <li><a href="/wiki/Dr%C3%A4gerwerk" class="mw-redirect" title="Drägerwerk">Drägerwerk</a></li> <li><a href="/wiki/Faber_Industrie_S.p.A." title="Faber Industrie S.p.A.">Faber</a></li> <li><a href="/wiki/Fenzy" title="Fenzy">Fenzy</a></li> <li><a href="/wiki/Maurice_Fernez" title="Maurice Fernez">Maurice Fernez</a></li> <li><a href="/wiki/Luigi_Ferraro_(naval_officer)" class="mw-redirect" title="Luigi Ferraro (naval officer)">Technisub</a></li> <li><a href="/wiki/Oscar_Gugen" title="Oscar Gugen">Oscar Gugen</a></li> <li><a href="/wiki/Heinke_(diving_equipment_manufacturer)" title="Heinke (diving equipment manufacturer)">Heinke</a></li> <li><a href="/wiki/HeinrichsWeikamp" title="HeinrichsWeikamp">HeinrichsWeikamp</a></li> <li><a href="/wiki/Johnson_Outdoors" title="Johnson Outdoors">Johnson Outdoors</a></li> <li><a href="/wiki/Mares_(scuba_equipment)" title="Mares (scuba equipment)">Mares</a></li> <li><a href="/wiki/Morse_Diving" title="Morse Diving">Morse Diving</a></li> <li><a href="/wiki/Nemrod" title="Nemrod">Nemrod</a></li> <li><a href="/wiki/Oceanic_Worldwide" title="Oceanic Worldwide">Oceanic Worldwide</a></li> <li><a href="/wiki/Porpoise_(scuba_gear)" title="Porpoise (scuba gear)">Porpoise</a></li> <li><a href="/wiki/Shearwater_Research" title="Shearwater Research">Shearwater Research</a></li> <li><a href="/wiki/Siebe_Gorman" title="Siebe Gorman">Siebe Gorman</a></li> <li><a href="/wiki/Submarine_Products" title="Submarine Products">Submarine Products</a></li> <li><a href="/wiki/Suunto" title="Suunto">Suunto</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Diving_support_equipment" style="font-size:114%;margin:0 4em"><a href="/wiki/Diving_support_equipment" title="Diving support equipment">Diving support equipment</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Access equipment</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Boarding_stirrup" class="mw-redirect" title="Boarding stirrup">Boarding stirrup</a></li> <li><a href="/wiki/Diver_lift" class="mw-redirect" title="Diver lift">Diver lift</a></li> <li><a href="/wiki/Diving_bell" title="Diving bell">Diving bell</a></li> <li><a href="/wiki/Diving_ladder" class="mw-redirect" title="Diving ladder">Diving ladder</a></li> <li><a href="/wiki/Diving_platform_(scuba)" class="mw-redirect" title="Diving platform (scuba)">Diving platform (scuba)</a></li> <li><a href="/wiki/Diving_stage" class="mw-redirect" title="Diving stage">Diving stage</a></li> <li><a href="/wiki/Downline_(diving)" title="Downline (diving)">Downline</a></li> <li><a href="/wiki/Jackstay" title="Jackstay">Jackstay</a></li> <li><a href="/wiki/Launch_and_recovery_system_(diving)" class="mw-redirect" title="Launch and recovery system (diving)">Launch and recovery system</a></li> <li><a href="/wiki/Messenger_line" title="Messenger line">Messenger line</a></li> <li><a href="/wiki/Moon_pool" title="Moon pool">Moon pool</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Breathing gas<br />handling</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diving_air_compressor#Filtration" title="Diving air compressor">Air filtration</a> <ul><li><a href="/wiki/Activated_carbon" title="Activated carbon">Activated carbon</a></li> <li><a href="/wiki/Hopcalite" title="Hopcalite">Hopcalite</a></li> <li><a href="/wiki/Molecular_sieve" title="Molecular sieve">Molecular sieve</a></li> <li><a href="/wiki/Silica_gel" title="Silica gel">Silica gel</a></li></ul></li> <li><a href="/wiki/Booster_pump" title="Booster pump">Booster pump</a></li> <li><a href="/wiki/Carbon_dioxide_scrubber" title="Carbon dioxide scrubber">Carbon dioxide scrubber</a></li> <li><a href="/wiki/Cascade_filling_system" title="Cascade filling system">Cascade filling system</a></li> <li><a href="/wiki/Diver%27s_pump" title="Diver's pump">Diver's pump</a></li> <li><a href="/wiki/Diving_air_compressor" title="Diving air compressor">Diving air compressor</a> <ul><li><a href="/wiki/Diving_air_filter" class="mw-redirect" title="Diving air filter">Diving air filter</a></li> <li><a href="/wiki/Water_separator" class="mw-redirect" title="Water separator">Water separator</a></li> <li><a href="/wiki/High_pressure_breathing_air_compressor" class="mw-redirect" title="High pressure breathing air compressor">High pressure breathing air compressor</a></li> <li><a href="/wiki/Low_pressure_breathing_air_compressor" class="mw-redirect" title="Low pressure breathing air compressor">Low pressure breathing air compressor</a></li></ul></li> <li><a href="/wiki/Gas_blending" title="Gas blending">Gas blending</a> <ul><li><a href="/wiki/Gas_blending_for_scuba_diving" title="Gas blending for scuba diving">Gas blending for scuba diving</a></li></ul></li> <li><a href="/wiki/Gas_panel" class="mw-redirect" title="Gas panel">Gas panel</a></li> <li><a href="/wiki/Gas_reclaim_system" class="mw-redirect" title="Gas reclaim system">Gas reclaim system</a></li> <li><a href="/wiki/Gas_storage_bank" class="mw-redirect" title="Gas storage bank">Gas storage bank</a> <ul><li><a href="/wiki/Gas_storage_quad" class="mw-redirect" title="Gas storage quad">Gas storage quad</a></li> <li><a href="/wiki/Gas_storage_tube" class="mw-redirect" title="Gas storage tube">Gas storage tube</a></li></ul></li> <li><a href="/wiki/Helium_analyzer" title="Helium analyzer">Helium analyzer</a></li> <li><a href="/wiki/Nitrox_production" class="mw-redirect" title="Nitrox production">Nitrox production</a> <ul><li><a href="/wiki/Membrane_gas_separation" title="Membrane gas separation">Membrane gas separation</a></li> <li><a href="/wiki/Pressure_swing_adsorption" title="Pressure swing adsorption">Pressure swing adsorption</a></li></ul></li> <li><a href="/wiki/Oxygen_analyser" class="mw-redirect" title="Oxygen analyser">Oxygen analyser</a> <ul><li><a href="/wiki/Electro-galvanic_oxygen_sensor" title="Electro-galvanic oxygen sensor">Electro-galvanic oxygen sensor</a></li></ul></li> <li><a href="/wiki/Oxygen_compatibility" title="Oxygen compatibility">Oxygen compatibility</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Decompression_equipment" title="Decompression equipment">Decompression<br />equipment</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Air-lock" class="mw-redirect" title="Air-lock">Air-lock</a></li> <li><a href="/wiki/Built-in_breathing_system" title="Built-in breathing system">Built-in breathing system</a></li> <li><a href="/wiki/Decompression_tables" class="mw-redirect" title="Decompression tables">Decompression tables</a></li> <li><a href="/wiki/Diving_bell" title="Diving bell">Diving bell</a> <ul><li><a href="/wiki/Bell_cursor" class="mw-redirect" title="Bell cursor">Bell cursor</a></li> <li><a href="/wiki/Closed_bell" class="mw-redirect" title="Closed bell">Closed bell</a></li> <li><a href="/wiki/Clump_weight" class="mw-redirect" title="Clump weight">Clump weight</a></li> <li><a href="/wiki/Launch_and_recovery_system_(diving)" class="mw-redirect" title="Launch and recovery system (diving)">Launch and recovery system</a></li> <li><a href="/wiki/Wet_bell" class="mw-redirect" title="Wet bell">Wet bell</a></li></ul></li> <li><a href="/wiki/Diving_chamber" title="Diving chamber">Diving chamber</a></li> <li><a href="/wiki/Diving_stage" class="mw-redirect" title="Diving stage">Diving stage</a></li> <li><a href="/wiki/Recreational_Dive_Planner" title="Recreational Dive Planner">Recreational Dive Planner</a></li> <li><a href="/wiki/Saturation_system" class="mw-redirect" title="Saturation system">Saturation system</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Platforms</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Dive_boat" title="Dive boat">Dive boat</a> <ul><li><a href="/wiki/Canoe_and_kayak_diving" title="Canoe and kayak diving">Canoe and kayak diving</a></li> <li><a href="/wiki/Combat_rubber_raiding_craft" title="Combat rubber raiding craft">Combat rubber raiding craft</a></li> <li><a href="/wiki/Liveaboard" title="Liveaboard">Liveaboard</a></li> <li><a href="/wiki/Subskimmer" title="Subskimmer">Subskimmer</a></li></ul></li> <li><a href="/wiki/Diving_support_vessel" title="Diving support vessel">Diving support vessel</a> <ul><li><a href="/wiki/HMS_Challenger_(K07)" title="HMS Challenger (K07)">HMS Challenger (K07)</a></li></ul></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Underwaterhabitat" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Underwater_habitat" title="Underwater habitat">Underwater<br />habitat</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aquarius_Reef_Base" title="Aquarius Reef Base">Aquarius Reef Base</a></li> <li><a href="/wiki/Continental_Shelf_Station_Two" title="Continental Shelf Station Two">Continental Shelf Station Two</a></li> <li><a href="/wiki/Helgoland_Habitat" title="Helgoland Habitat">Helgoland Habitat</a></li> <li><a href="/wiki/Scott_Carpenter_Space_Analog_Station" title="Scott Carpenter Space Analog Station">Scott Carpenter Space Analog Station</a></li> <li><a href="/wiki/SEALAB" title="SEALAB">SEALAB</a></li> <li><a href="/wiki/Tektite_habitat" title="Tektite habitat">Tektite habitat</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Remotely_operated_underwater_vehicle" title="Remotely operated underwater vehicle">Remotely operated<br />underwater vehicles</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/8A4-class_ROUV" title="8A4-class ROUV">8A4-class ROUV</a></li> <li><a href="/wiki/ABISMO" title="ABISMO">ABISMO</a></li> <li><a href="/wiki/Atlantis_ROV_Team" title="Atlantis ROV Team">Atlantis ROV Team</a></li> <li><a href="/wiki/COTSBot" title="COTSBot">COTSBot</a></li> <li><a href="/wiki/CURV" title="CURV">CURV</a></li> <li><a href="/wiki/Deep_Drone" title="Deep Drone">Deep Drone</a></li> <li><a href="/wiki/%C3%89paulard" title="Épaulard">Épaulard</a></li> <li><a href="/wiki/Global_Explorer_ROV" title="Global Explorer ROV">Global Explorer ROV</a></li> <li><a href="/wiki/Goldfish-class_ROUV" title="Goldfish-class ROUV">Goldfish-class ROUV</a></li> <li><a href="/wiki/Kaik%C5%8D_ROV" title="Kaikō ROV">Kaikō ROV</a></li> <li><a href="/wiki/Ka%C5%9Fif_ROUV" title="Kaşif ROUV">Kaşif ROUV</a></li> <li><a href="/wiki/Long-Term_Mine_Reconnaissance_System" title="Long-Term Mine Reconnaissance System">Long-Term Mine Reconnaissance System</a></li> <li><a href="/wiki/Mini_Rover_ROV" title="Mini Rover ROV">Mini Rover ROV</a></li> <li><a href="/wiki/OpenROV" title="OpenROV">OpenROV</a></li> <li><a href="/wiki/ROV_KIEL_6000" title="ROV KIEL 6000">ROV KIEL 6000</a></li> <li><a href="/wiki/ROV_PHOCA" title="ROV PHOCA">ROV PHOCA</a></li> <li><a href="/wiki/Scorpio_ROV" title="Scorpio ROV">Scorpio ROV</a></li> <li><a href="/wiki/Sea_Dragon-class_ROV" title="Sea Dragon-class ROV">Sea Dragon-class ROV</a></li> <li><a href="/wiki/Seabed_tractor" title="Seabed tractor">Seabed tractor</a></li> <li><a href="/wiki/Seafox_drone" title="Seafox drone">Seafox drone</a></li> <li><a href="/wiki/SeaPerch" title="SeaPerch">SeaPerch</a></li> <li><a href="/wiki/SJT-class_ROUV" title="SJT-class ROUV">SJT-class ROUV</a></li> <li><a href="/wiki/T1200_Trenching_Unit" title="T1200 Trenching Unit">T1200 Trenching Unit</a></li> <li><a href="/wiki/VideoRay_UROVs" title="VideoRay UROVs">VideoRay UROVs</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Safety equipment</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diver_down_flag" title="Diver down flag">Diver down flag</a></li> <li><a href="/wiki/Diving_shot" title="Diving shot">Diving shot</a></li> <li><a href="/wiki/ENOS_Rescue-System" title="ENOS Rescue-System">ENOS Rescue-System</a></li> <li><a href="/wiki/Hyperbaric_lifeboat" class="mw-redirect" title="Hyperbaric lifeboat">Hyperbaric lifeboat</a></li> <li><a href="/wiki/Hyperbaric_stretcher" title="Hyperbaric stretcher">Hyperbaric stretcher</a></li> <li><a href="/wiki/Jackstay_(diving)" class="mw-redirect" title="Jackstay (diving)">Jackstay</a></li> <li><a href="/wiki/Jonline" class="mw-redirect" title="Jonline">Jonline</a></li> <li><a href="/wiki/Reserve_gas_supply_(diving)" class="mw-redirect" title="Reserve gas supply (diving)">Reserve gas supply</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">General</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diving_spread" class="mw-redirect" title="Diving spread">Diving spread</a> <ul><li><a href="/wiki/Air_spread" class="mw-redirect" title="Air spread">Air spread</a></li> <li><a href="/wiki/Saturation_spread" class="mw-redirect" title="Saturation spread">Saturation spread</a></li></ul></li> <li><a href="/wiki/Hot_water_system_(diving)" class="mw-redirect" title="Hot water system (diving)">Hot water system</a></li> <li><a href="/wiki/Sonar" title="Sonar">Sonar</a> <ul><li><a href="/wiki/Underwater_acoustic_positioning_system" title="Underwater acoustic positioning system">Underwater acoustic positioning system</a></li> <li><a href="/wiki/Underwater_acoustic_communication" title="Underwater acoustic communication">Underwater acoustic communication</a></li></ul></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Freediving" style="font-size:114%;margin:0 4em"><a href="/wiki/Freediving" title="Freediving">Freediving</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Activities</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aquathlon_(underwater_wrestling)" title="Aquathlon (underwater wrestling)">Aquathlon</a></li> <li><a href="/wiki/Apnoea_finswimming" class="mw-redirect" title="Apnoea finswimming">Apnoea finswimming</a></li> <li><a href="/wiki/Freediving" title="Freediving">Freediving</a></li> <li><a href="/wiki/Haenyeo" title="Haenyeo">Haenyeo</a></li> <li><a href="/wiki/Pearl_hunting" title="Pearl hunting">Pearl hunting</a> <ul><li><a href="/wiki/Ama_(diving)" title="Ama (diving)">Ama</a></li></ul></li> <li><a href="/wiki/Snorkeling" title="Snorkeling">Snorkeling</a></li> <li><a href="/wiki/Spearfishing" title="Spearfishing">Spearfishing</a></li> <li><a href="/wiki/Underwater_football" title="Underwater football">Underwater football</a></li> <li><a href="/wiki/Underwater_hockey" title="Underwater hockey">Underwater hockey</a></li> <li><a href="/wiki/Underwater_rugby" title="Underwater rugby">Underwater rugby</a></li> <li><a href="/wiki/Underwater_target_shooting" title="Underwater target shooting">Underwater target shooting</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Competitions</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Nordic_Deep" title="Nordic Deep">Nordic Deep</a></li> <li><a href="/wiki/Vertical_Blue" title="Vertical Blue">Vertical Blue</a></li> <li>Disciplines <ul><li><a href="/wiki/Constant_weight" class="mw-redirect" title="Constant weight">Constant weight</a> (CWT)</li> <li><a href="/wiki/Constant_weight_bi-fins" title="Constant weight bi-fins">Constant weight bi-fins</a> (CWTB)</li> <li><a href="/wiki/Constant_weight_without_fins" title="Constant weight without fins">Constant weight without fins</a> (CNF)</li> <li><a href="/wiki/Dynamic_apnea" title="Dynamic apnea">Dynamic apnea</a> (DYN)</li> <li><a href="/wiki/Dynamic_apnea_without_fins" class="mw-redirect" title="Dynamic apnea without fins">Dynamic apnea without fins</a> (DNF)</li> <li><a href="/wiki/Free_immersion" class="mw-redirect" title="Free immersion">Free immersion</a> (FIM)</li> <li><a href="/wiki/No-limits_apnea" title="No-limits apnea">No-limits apnea</a> (NLT)</li> <li><a href="/wiki/Static_apnea" title="Static apnea">Static apnea</a> (STA)</li> <li><a href="/wiki/Skandalopetra_diving" title="Skandalopetra diving">Skandalopetra diving</a></li> <li><a href="/wiki/Variable_weight_apnea" class="mw-redirect" title="Variable weight apnea">Variable weight apnea</a> (VWT)</li> <li><a href="/wiki/Variable_weight_apnea_without_fins" class="mw-redirect" title="Variable weight apnea without fins">Variable weight apnea without fins</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Equipment</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diving_mask" title="Diving mask">Diving mask</a></li> <li><a href="/wiki/Diving_suit" title="Diving suit">Diving suit</a></li> <li><a href="/wiki/Hawaiian_sling" title="Hawaiian sling">Hawaiian sling</a></li> <li><a href="/wiki/Polespear" title="Polespear">Polespear</a></li> <li><a href="/wiki/Snorkel_(swimming)" title="Snorkel (swimming)">Snorkel (swimming)</a></li> <li><a href="/wiki/Speargun" title="Speargun">Speargun</a></li> <li><a href="/wiki/Swimfin" title="Swimfin">Swimfins</a> <ul><li><a href="/wiki/Monofin" title="Monofin">Monofin</a></li></ul></li> <li><a href="/wiki/Water_polo_cap" title="Water polo cap">Water polo cap</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Freedivers</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Deborah_Andollo" title="Deborah Andollo">Deborah Andollo</a></li> <li><a href="/wiki/Simone_Arrigoni" title="Simone Arrigoni">Simone Arrigoni</a></li> <li><a href="/wiki/Peppo_Biscarini" title="Peppo Biscarini">Peppo Biscarini</a></li> <li><a href="/wiki/Michael_Board" title="Michael Board">Michael Board</a></li> <li><a href="/wiki/Sara_Campbell" title="Sara Campbell">Sara Campbell</a></li> <li><a href="/wiki/Derya_Can_G%C3%B6%C3%A7en" class="mw-redirect" title="Derya Can Göçen">Derya Can Göçen</a></li> <li><a href="/wiki/Goran_%C4%8Colak" title="Goran Čolak">Goran Čolak</a></li> <li><a href="/wiki/Carlos_Coste" title="Carlos Coste">Carlos Coste</a></li> <li><a href="/wiki/Robert_Croft_(diver)" title="Robert Croft (diver)">Robert Croft</a></li> <li><a href="/wiki/Mandy-Rae_Cruickshank" title="Mandy-Rae Cruickshank">Mandy-Rae Cruickshank</a></li> <li><a href="/wiki/Yasemin_Dalk%C4%B1l%C4%B1%C3%A7" title="Yasemin Dalkılıç">Yasemin Dalkılıç</a></li> <li><a href="/wiki/Leonardo_D%27Imporzano" title="Leonardo D'Imporzano">Leonardo D'Imporzano</a></li> <li><a href="/wiki/Flavia_Eberhard" title="Flavia Eberhard">Flavia Eberhard</a></li> <li><a href="/wiki/%C5%9Eahika_Erc%C3%BCmen" title="Şahika Ercümen">Şahika Ercümen</a></li> <li><a href="/wiki/Emma_Farrell_(freediver)" title="Emma Farrell (freediver)">Emma Farrell</a></li> <li><a href="/wiki/Francisco_Ferreras" title="Francisco Ferreras">Francisco Ferreras</a></li> <li><a href="/wiki/Pierre_Frolla" title="Pierre Frolla">Pierre Frolla</a></li> <li><a href="/wiki/Flavia_Eberhard" title="Flavia Eberhard">Flavia Eberhard</a></li> <li><a href="/wiki/Mehgan_Heaney-Grier" title="Mehgan Heaney-Grier">Mehgan Heaney-Grier</a></li> <li><a href="/wiki/Elisabeth_Kristoffersen" title="Elisabeth Kristoffersen">Elisabeth Kristoffersen</a></li> <li><a href="/wiki/Andriy_Yevhenovych_Khvetkevych" class="mw-redirect" title="Andriy Yevhenovych Khvetkevych">Andriy Yevhenovych Khvetkevych</a></li> <li><a href="/wiki/Lo%C3%AFc_Leferme" title="Loïc Leferme">Loïc Leferme</a></li> <li><a href="/wiki/Enzo_Maiorca" title="Enzo Maiorca">Enzo Maiorca</a></li> <li><a href="/wiki/Jacques_Mayol" title="Jacques Mayol">Jacques Mayol</a></li> <li><a href="/wiki/Audrey_Mestre" title="Audrey Mestre">Audrey Mestre</a></li> <li><a href="/wiki/Karol_Meyer" title="Karol Meyer">Karol Meyer</a></li> <li><a href="/wiki/Kate_Middleton_(free-diver)" title="Kate Middleton (free-diver)">Kate Middleton</a></li> <li><a href="/wiki/St%C3%A9phane_Mifsud" title="Stéphane Mifsud">Stéphane Mifsud</a></li> <li><a href="/wiki/Alexey_Molchanov" title="Alexey Molchanov">Alexey Molchanov</a></li> <li><a href="/wiki/Natalia_Molchanova" title="Natalia Molchanova">Natalia Molchanova</a></li> <li><a href="/wiki/Dave_Mullins_(freediver)" title="Dave Mullins (freediver)">Dave Mullins</a></li> <li><a href="/wiki/Patrick_Musimu" title="Patrick Musimu">Patrick Musimu</a></li> <li><a href="/wiki/Guillaume_N%C3%A9ry" title="Guillaume Néry">Guillaume Néry</a></li> <li><a href="/wiki/Herbert_Nitsch" title="Herbert Nitsch">Herbert Nitsch</a></li> <li><a href="/wiki/Umberto_Pelizzari" title="Umberto Pelizzari">Umberto Pelizzari</a></li> <li><a href="/wiki/Liv_Philip" title="Liv Philip">Liv Philip</a></li> <li><a href="/wiki/Annelie_Pompe" title="Annelie Pompe">Annelie Pompe</a></li> <li><a href="/wiki/Stig_Severinsen" title="Stig Severinsen">Stig Severinsen</a></li> <li><a href="/wiki/Tom_Sietas" title="Tom Sietas">Tom Sietas</a></li> <li><a href="/wiki/Aharon_Solomons" title="Aharon Solomons">Aharon Solomons</a></li> <li><a href="/wiki/Martin_%C5%A0t%C4%9Bp%C3%A1nek_(free-diver)" class="mw-redirect" title="Martin Štěpánek (free-diver)">Martin Štěpánek</a></li> <li><a href="/wiki/Walter_Steyn" title="Walter Steyn">Walter Steyn</a></li> <li><a href="/wiki/Tanya_Streeter" title="Tanya Streeter">Tanya Streeter</a></li> <li><a href="/wiki/William_Trubridge" title="William Trubridge">William Trubridge</a></li> <li><a href="/wiki/Devrim_Cenk_Ulusoy" title="Devrim Cenk Ulusoy">Devrim Cenk Ulusoy</a></li> <li><a href="/wiki/Fatma_Uruk" title="Fatma Uruk">Fatma Uruk</a></li> <li><a href="/wiki/Danai_Varveri" title="Danai Varveri">Danai Varveri</a></li> <li><a href="/wiki/Alessia_Zecchini" title="Alessia Zecchini">Alessia Zecchini</a></li> <li><a href="/wiki/Nataliia_Zharkova" title="Nataliia Zharkova">Nataliia Zharkova</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Hazards</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Barotrauma" title="Barotrauma">Barotrauma</a></li> <li><a href="/wiki/Drowning" title="Drowning">Drowning</a></li> <li><a href="/wiki/Freediving_blackout" title="Freediving blackout">Freediving blackout</a> <ul><li><a href="/wiki/Deep-water_blackout" class="mw-redirect" title="Deep-water blackout">Deep-water blackout</a></li> <li><a href="/wiki/Freediving_blackout#Terminology" title="Freediving blackout">Shallow-water blackout</a></li></ul></li> <li><a href="/wiki/Hypercapnia" title="Hypercapnia">Hypercapnia</a></li> <li><a href="/wiki/Hypothermia" title="Hypothermia">Hypothermia</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Historical</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ama_(diving)" title="Ama (diving)">Ama</a></li> <li><a href="/wiki/Octopus_wrestling" title="Octopus wrestling">Octopus wrestling</a></li> <li><a href="/wiki/Swimming_at_the_1900_Summer_Olympics_%E2%80%93_Men%27s_underwater_swimming" title="Swimming at the 1900 Summer Olympics – Men's underwater swimming">Swimming at the 1900 Summer Olympics – Men's underwater swimming</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Organisations</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/AIDA_International" title="AIDA International">AIDA International</a></li> <li><a href="/wiki/Scuba_Schools_International" title="Scuba Schools International">Scuba Schools International</a></li> <li><a href="/wiki/Australian_Underwater_Federation" title="Australian Underwater Federation">Australian Underwater Federation</a></li> <li><a href="/wiki/British_Freediving_Association" title="British Freediving Association">British Freediving Association</a></li> <li><a href="/wiki/Conf%C3%A9d%C3%A9ration_Mondiale_des_Activit%C3%A9s_Subaquatiques" title="Confédération Mondiale des Activités Subaquatiques">Confédération Mondiale des Activités Subaquatiques</a></li> <li><a href="/wiki/F%C3%A9d%C3%A9ration_Fran%C3%A7aise_d%27%C3%89tudes_et_de_Sports_Sous-Marins" title="Fédération Française d'Études et de Sports Sous-Marins">Fédération Française d'Études et de Sports Sous-Marins</a></li> <li><a href="/wiki/Performance_Freediving_International" title="Performance Freediving International">Performance Freediving International</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Professional_diving" style="font-size:114%;margin:0 4em"><a href="/wiki/Professional_diving" title="Professional diving">Professional diving</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Occupations</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ama_(diving)" title="Ama (diving)">Ama</a></li> <li><a href="/wiki/Commercial_diver" class="mw-redirect" title="Commercial diver">Commercial diver</a> <ul><li><a href="/wiki/Commercial_offshore_diver" class="mw-redirect" title="Commercial offshore diver">Commercial offshore diver</a></li> <li><a href="/wiki/Hazmat_diver" class="mw-redirect" title="Hazmat diver">Hazmat diver</a></li></ul></li> <li><a href="/wiki/Divemaster" title="Divemaster">Divemaster</a></li> <li><a href="/wiki/Diving_instructor" title="Diving instructor">Diving instructor</a></li> <li><a href="/wiki/Diving_safety_officer" title="Diving safety officer">Diving safety officer</a></li> <li><a href="/wiki/Diving_superintendent" class="mw-redirect" title="Diving superintendent">Diving superintendent</a></li> <li><a href="/wiki/Diving_supervisor" title="Diving supervisor">Diving supervisor</a></li> <li><a href="/wiki/Haenyeo" title="Haenyeo">Haenyeo</a></li> <li><a href="/wiki/Media_diver" class="mw-redirect" title="Media diver">Media diver</a></li> <li><a href="/wiki/Police_diver" class="mw-redirect" title="Police diver">Police diver</a></li> <li><a href="/wiki/Public_safety_diver" class="mw-redirect" title="Public safety diver">Public safety diver</a></li> <li><a href="/wiki/Scientific_diver" class="mw-redirect" title="Scientific diver">Scientific diver</a></li> <li><a href="/wiki/Underwater_archaeologist" class="mw-redirect" title="Underwater archaeologist">Underwater archaeologist</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Militarydiving" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Military_diving" title="Military diving">Military<br />diving</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Army_engineer_diver" title="Army engineer diver">Army engineer diver</a></li> <li><a href="/wiki/Canadian_Armed_Forces_Divers" title="Canadian Armed Forces Divers">Canadian Armed Forces Divers</a></li> <li><a href="/wiki/Clearance_diver" title="Clearance diver">Clearance diver</a></li> <li><a href="/wiki/Frogman" title="Frogman">Frogman</a></li> <li><a href="/wiki/Minentaucher" title="Minentaucher">Minentaucher</a></li> <li><a href="/wiki/Royal_Navy_ships_diver" title="Royal Navy ships diver">Royal Navy ships diver</a></li> <li><a href="/wiki/United_States_military_divers" title="United States military divers">United States military divers</a> <ul><li><a href="/wiki/Navy_diver_(United_States_Navy)" title="Navy diver (United States Navy)">U.S. Navy diver</a></li> <li><a href="/wiki/Master_diver_(United_States_Navy)" title="Master diver (United States Navy)">U.S.Navy master diver</a></li></ul></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Militarydivingunits" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_military_diving_units" title="List of military diving units">Military<br />diving<br />units</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Clearance_Diving_Branch_(RAN)" title="Clearance Diving Branch (RAN)">Clearance Diving Branch (RAN)</a></li> <li><a href="/wiki/Commando_Hubert" class="mw-redirect" title="Commando Hubert">Commando Hubert</a></li> <li><a href="/wiki/Lithuanian_Special_Operations_Force" title="Lithuanian Special Operations Force">Combat Divers Service (Lithuania)</a></li> <li><a href="/wiki/Comando_Raggruppamento_Subacquei_e_Incursori_Teseo_Tesei" title="Comando Raggruppamento Subacquei e Incursori Teseo Tesei">Comando Raggruppamento Subacquei e Incursori Teseo Tesei</a></li> <li><a href="/wiki/Decima_Flottiglia_MAS" title="Decima Flottiglia MAS">Decima Flottiglia MAS</a></li> <li><a href="/wiki/Frogman_Corps_(Denmark)" title="Frogman Corps (Denmark)">Frogman Corps (Denmark)</a></li> <li><a href="/wiki/Fuerzas_Especiales" title="Fuerzas Especiales">Fuerzas Especiales</a></li> <li><a href="/wiki/Fukuryu" title="Fukuryu">Fukuryu</a></li> <li><a href="/wiki/GRUMEC" title="GRUMEC">GRUMEC</a></li> <li><a href="/wiki/Grup_Gerak_Khas" class="mw-redirect" title="Grup Gerak Khas">Grup Gerak Khas</a></li> <li><a href="/wiki/Jagdkommando" title="Jagdkommando">Jagdkommando</a></li> <li><a href="/wiki/JW_Formoza" class="mw-redirect" title="JW Formoza">JW Formoza</a></li> <li><a href="/wiki/JW_GROM" class="mw-redirect" title="JW GROM">JW GROM</a></li> <li><a href="/wiki/JW_Komandos%C3%B3w" class="mw-redirect" title="JW Komandosów">JW Komandosów</a></li> <li><a href="/wiki/Kommando_Spezialkr%C3%A4fte_Marine" title="Kommando Spezialkräfte Marine">Kommando Spezialkräfte Marine</a></li> <li><a href="/wiki/KOPASKA" title="KOPASKA">KOPASKA</a></li> <li><a href="/wiki/MARCOS" title="MARCOS">MARCOS</a></li> <li><a href="/wiki/Marine_Commandos" title="Marine Commandos">Marine Commandos</a></li> <li><a href="/wiki/Marinejegerkommandoen" title="Marinejegerkommandoen">Marinejegerkommandoen</a></li> <li><a href="/wiki/Marine_Raider_Regiment" title="Marine Raider Regiment">Marine Raider Regiment</a></li> <li><a href="/wiki/Minedykkerkommandoen" title="Minedykkerkommandoen">Minedykkerkommandoen</a></li> <li><a href="/wiki/Namibian_Marine_Corps#Operational_Diving_Unit" title="Namibian Marine Corps">Namibian Marine Corps Operational Diving Unit</a></li> <li><a href="/wiki/Naval_Diving_Unit_(Singapore)" title="Naval Diving Unit (Singapore)">Naval Diving Unit (Singapore)</a></li> <li><a href="/wiki/Naval_Service_Diving_Section" title="Naval Service Diving Section">Naval Service Diving Section</a></li> <li><a href="/wiki/Naval_Special_Operations_Command" title="Naval Special Operations Command">Naval Special Operations Command</a></li> <li><a href="/wiki/Operational_Diving_Division_(SA_Navy)" title="Operational Diving Division (SA Navy)">Operational Diving Division (SA Navy)</a></li> <li><a href="/wiki/Royal_Engineers" title="Royal Engineers">Royal Engineers</a></li> <li><a href="/wiki/Russian_commando_frogmen" title="Russian commando frogmen">Russian commando frogmen</a></li> <li><a href="/wiki/Sappers_Divers_Group" title="Sappers Divers Group">Sappers Divers Group</a></li> <li><a href="/wiki/Shayetet_13" title="Shayetet 13">Shayetet 13</a></li> <li><a href="/wiki/Special_Air_Service" title="Special Air Service">Special Air Service</a></li> <li><a href="/wiki/Special_Air_Service_Regiment" title="Special Air Service Regiment">Special Air Service Regiment</a></li> <li><a href="/wiki/Special_Actions_Detachment" title="Special Actions Detachment">Special Actions Detachment</a></li> <li><a href="/wiki/Special_Boat_Service" title="Special Boat Service">Special Boat Service</a></li> <li><a href="/wiki/Special_Boat_Squadron_(Sri_Lanka)" title="Special Boat Squadron (Sri Lanka)">Special Boat Squadron (Sri Lanka)</a></li> <li><a href="/wiki/Special_Forces_Command_(Turkey)" title="Special Forces Command (Turkey)">Special Forces Command (Turkey)</a></li> <li><a href="/wiki/Special_Forces_Group_(Belgium)" title="Special Forces Group (Belgium)">Special Forces Group (Belgium)</a></li> <li><a href="/wiki/Special_Operations_Battalion_(Croatia)" title="Special Operations Battalion (Croatia)">Special Operations Battalion (Croatia)</a></li> <li><a href="/wiki/Special_Service_Group_(Navy)" title="Special Service Group (Navy)">Special Service Group (Navy)</a></li> <li><a href="/wiki/Special_Warfare_Diving_and_Salvage" title="Special Warfare Diving and Salvage">Special Warfare Diving and Salvage</a></li> <li><a href="/wiki/Tactical_Divers_Group" title="Tactical Divers Group">Tactical Divers Group</a></li> <li><a href="/wiki/United_States_Marine_Corps_Force_Reconnaissance" title="United States Marine Corps Force Reconnaissance">US Marine Corps Force Reconnaissance</a></li> <li><a href="/wiki/United_States_Marine_Corps_Reconnaissance_Battalions" title="United States Marine Corps Reconnaissance Battalions">US Marine Corps Reconnaissance Battalions</a></li> <li><a href="/wiki/United_States_Navy_SEALs" title="United States Navy SEALs">US Navy SEALs</a></li> <li><a href="/wiki/Underwater_Construction_Teams" title="Underwater Construction Teams">Underwater Construction Teams</a></li> <li><a href="/wiki/Underwater_Demolition_Command" title="Underwater Demolition Command">Underwater Demolition Command</a></li> <li><a href="/wiki/Underwater_Demolition_Team" title="Underwater Demolition Team">Underwater Demolition Team</a></li> <li><a href="/wiki/Underwater_Offence_(Turkish_Armed_Forces)" title="Underwater Offence (Turkish Armed Forces)">Underwater Offence (Turkish Armed Forces)</a></li> <li><a href="/wiki/UNGERIN" title="UNGERIN">UNGERIN</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Underwater_work" title="Underwater work">Underwater<br />work</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Commercial_offshore_diving" title="Commercial offshore diving">Commercial offshore diving</a></li> <li><a href="/wiki/Dive_leader" title="Dive leader">Dive leader</a></li> <li><a href="/wiki/Diver_training" title="Diver training">Diver training</a> <ul><li><a href="/wiki/Recreational_diver_training" title="Recreational diver training">Recreational diver training</a></li></ul></li> <li><a href="/wiki/Hazmat_diving" title="Hazmat diving">Hazmat diving</a></li> <li><a href="/wiki/Hyperbaric_welding" title="Hyperbaric welding">Hyperbaric welding</a></li> <li><a href="/wiki/Marine_construction" title="Marine construction">Marine construction</a> <ul><li><a href="/wiki/Offshore_construction" title="Offshore construction">Offshore construction</a></li> <li><a href="/wiki/Underwater_construction" title="Underwater construction">Underwater construction</a></li></ul></li> <li><a href="/wiki/Media_diving" title="Media diving">Media diving</a></li> <li><a href="/wiki/Pearl_hunting" title="Pearl hunting">Pearl hunting</a></li> <li><a href="/wiki/Police_diving" title="Police diving">Police diving</a></li> <li><a href="/wiki/Potable_water_diving" title="Potable water diving">Potable water diving</a></li> <li><a href="/wiki/Public_safety_diving" title="Public safety diving">Public safety diving</a></li> <li><a href="/wiki/Scientific_diving" title="Scientific diving">Scientific diving</a></li> <li><a href="/wiki/Ships_husbandry" title="Ships husbandry">Ships husbandry</a></li> <li><a href="/wiki/Sponge_diving" title="Sponge diving">Sponge diving</a></li> <li><a href="/wiki/Submarine_pipeline" title="Submarine pipeline">Submarine pipeline</a></li> <li><a href="/wiki/Underwater_archaeology" title="Underwater archaeology">Underwater archaeology</a> <ul><li><a href="/wiki/Archaeology_of_shipwrecks" title="Archaeology of shipwrecks">Archaeology of shipwrecks</a></li></ul></li> <li><a href="/wiki/Underwater_cutting_and_welding" title="Underwater cutting and welding">Underwater cutting and welding</a></li> <li><a href="/wiki/Underwater_demolition" title="Underwater demolition">Underwater demolition</a></li> <li><a href="/wiki/Underwater_inspection" class="mw-redirect" title="Underwater inspection">Underwater inspection</a> <ul><li><a href="/wiki/Nondestructive_testing" title="Nondestructive testing">Nondestructive testing</a></li></ul></li> <li><a href="/wiki/Underwater_logging" title="Underwater logging">Underwater logging</a></li> <li><a href="/wiki/Underwater_photography" title="Underwater photography">Underwater photography</a></li> <li><a href="/wiki/Underwater_search_and_recovery" title="Underwater search and recovery">Underwater search and recovery</a> <ul><li><a class="mw-selflink selflink">Underwater searches</a></li></ul></li> <li><a href="/wiki/Underwater_videography" title="Underwater videography">Underwater videography</a></li> <li><a href="/wiki/Underwater_survey" title="Underwater survey">Underwater survey</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Salvage_diving" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Salvage_diving" title="Salvage diving">Salvage diving</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/SS_Egypt" title="SS Egypt">SS <i>Egypt</i></a></li> <li><a href="/wiki/Kronan_(ship)" title="Kronan (ship)"><i>Kronan</i></a></li> <li><a href="/wiki/La_Belle_(ship)" title="La Belle (ship)"><i>La Belle</i></a></li> <li><a href="/wiki/SS_Laurentic_(1908)" title="SS Laurentic (1908)">SS <i>Laurentic</i></a></li> <li><a href="/wiki/RMS_Lusitania" title="RMS Lusitania">RMS <i>Lusitania</i></a></li> <li><a href="/wiki/Swedish_warship_Mars" title="Swedish warship Mars"><i>Mars</i></a></li> <li><a href="/wiki/Mary_Rose" title="Mary Rose"><i>Mary Rose</i></a></li> <li><a href="/wiki/USS_Monitor" title="USS Monitor">USS <i>Monitor</i></a></li> <li><a href="/wiki/HMS_Royal_George_(1756)" title="HMS Royal George (1756)">HMS <i>Royal George</i></a></li> <li><a href="/wiki/Vasa_(ship)" title="Vasa (ship)"><i>Vasa</i></a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diving_contractor" class="mw-redirect" title="Diving contractor">Diving<br />contractors</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Compagnie_maritime_d%27expertises" title="Compagnie maritime d'expertises">COMEX</a></li> <li><a href="/wiki/Helix_Energy_Solutions_Group" title="Helix Energy Solutions Group">Helix Energy Solutions Group</a></li> <li><a href="/wiki/International_Marine_Contractors_Association" title="International Marine Contractors Association">International Marine Contractors Association</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Tools and<br />equipment</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Abrasive_waterjet" class="mw-redirect" title="Abrasive waterjet">Abrasive waterjet</a></li> <li><a href="/wiki/Airlift_(dredging_device)" title="Airlift (dredging device)">Airlift</a></li> <li><a href="/wiki/Baited_remote_underwater_video" title="Baited remote underwater video">Baited remote underwater video</a></li> <li><a href="/wiki/In-water_surface_cleaning" title="In-water surface cleaning">In-water surface cleaning</a> <ul><li>Brush cart</li> <li><a href="/w/index.php?title=Cavitation_cleaning&action=edit&redlink=1" class="new" title="Cavitation cleaning (page does not exist)">Cavitation cleaning</a></li> <li><a href="/wiki/Pressure_washing" title="Pressure washing">Pressure washing</a></li> <li><a href="/wiki/Pigging" title="Pigging">Pigging</a></li></ul></li> <li><a href="/wiki/Hot_stab" title="Hot stab">Hot stab</a></li> <li><a href="/wiki/Lifting_bag" title="Lifting bag">Lifting bag</a></li> <li><a href="/wiki/Remotely_operated_underwater_vehicle" title="Remotely operated underwater vehicle">Remotely operated underwater vehicle</a></li> <li><a href="/wiki/Thermal_lance" title="Thermal lance">Thermal lance</a></li> <li><a href="/wiki/Tremie" title="Tremie">Tremie</a></li> <li><a href="/w/index.php?title=Water_jetting&action=edit&redlink=1" class="new" title="Water jetting (page does not exist)">Water jetting</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Underwater<br />weapons</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Limpet_mine" title="Limpet mine">Limpet mine</a></li> <li><a href="/wiki/Speargun" title="Speargun">Speargun</a> <ul><li><a href="/wiki/Hawaiian_sling" title="Hawaiian sling">Hawaiian sling</a></li> <li><a href="/wiki/Polespear" title="Polespear">Polespear</a></li></ul></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Underwaterfirearm" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Underwater_firearm" title="Underwater firearm">Underwater<br />firearm</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Gyrojet" title="Gyrojet">Gyrojet</a></li> <li><a href="/wiki/Mk_1_Underwater_Defense_Gun" title="Mk 1 Underwater Defense Gun">Mk 1 Underwater Defense Gun</a></li> <li><a href="/wiki/Powerhead_(firearm)" title="Powerhead (firearm)">Powerhead</a></li> <li>Underwater pistols <ul><li><a href="/wiki/Heckler_%26_Koch_P11" title="Heckler & Koch P11">Heckler & Koch P11</a></li> <li><a href="/wiki/SPP-1_underwater_pistol" title="SPP-1 underwater pistol">SPP-1 underwater pistol</a></li></ul></li> <li>Underwater revolvers <ul><li><a href="/wiki/AAI_underwater_revolver" title="AAI underwater revolver">AAI underwater revolver</a></li></ul></li> <li>Underwater rifles <ul><li><a href="/wiki/ADS_amphibious_rifle" title="ADS amphibious rifle">ADS amphibious rifle</a></li> <li><a href="/wiki/APS_underwater_rifle" title="APS underwater rifle">APS underwater rifle</a></li> <li><a href="/wiki/ASM-DT_amphibious_rifle" title="ASM-DT amphibious rifle">ASM-DT amphibious rifle</a></li> <li><a href="/wiki/QBS-06" title="QBS-06">QBS-06</a></li></ul></li></ul> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Recreational_diving" style="font-size:114%;margin:0 4em"><a href="/wiki/Recreational_diving" title="Recreational diving">Recreational diving</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Recreational_dive_sites" title="Recreational dive sites">Recreational dive sites</a></li> <li><a href="/wiki/Index_of_recreational_dive_sites" title="Index of recreational dive sites">Index of recreational dive sites</a></li> <li><a href="/wiki/List_of_wreck_diving_sites" title="List of wreck diving sites">List of wreck diving sites</a></li> <li><a href="/wiki/Outline_of_recreational_dive_sites" title="Outline of recreational dive sites">Outline of recreational dive sites</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Specialties</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Altitude_diving" title="Altitude diving">Altitude diving</a></li> <li><a href="/wiki/Cave_diving" title="Cave diving">Cave diving</a></li> <li><a href="/wiki/Deep_diving" title="Deep diving">Deep diving</a></li> <li><a href="/wiki/Ice_diving" title="Ice diving">Ice diving</a></li> <li><a href="/wiki/Muck_diving" title="Muck diving">Muck diving</a></li> <li><a href="/wiki/Open-water_diving" title="Open-water diving">Open-water diving</a></li> <li><a href="/wiki/Rebreather_diving" title="Rebreather diving">Rebreather diving</a></li> <li><a href="/wiki/Sidemount_diving" title="Sidemount diving">Sidemount diving</a></li> <li><a href="/wiki/Solo_diving" title="Solo diving">Solo diving</a></li> <li><a href="/wiki/Technical_diving" title="Technical diving">Technical diving</a></li> <li><a href="/wiki/Underwater_photography" title="Underwater photography">Underwater photography</a></li> <li><a href="/wiki/Wreck_diving" title="Wreck diving">Wreck diving</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diver_organisations" title="Diver organisations">Diver<br />organisations</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/British_Sub-Aqua_Club" title="British Sub-Aqua Club">British Sub-Aqua Club</a> (BSAC)</li> <li><a href="/wiki/Cave_Divers_Association_of_Australia" title="Cave Divers Association of Australia">Cave Divers Association of Australia</a> (CDAA)</li> <li><a href="/wiki/Cave_Diving_Group" title="Cave Diving Group">Cave Diving Group</a> (CDG)</li> <li><a href="/wiki/Comhairle_Fo-Thuinn" title="Comhairle Fo-Thuinn">Comhairle Fo-Thuinn</a> (CFT)</li> <li><a href="/wiki/Conf%C3%A9d%C3%A9ration_Mondiale_des_Activit%C3%A9s_Subaquatiques" title="Confédération Mondiale des Activités Subaquatiques">Confédération Mondiale des Activités Subaquatiques</a> (CMAS)</li> <li><a href="/wiki/Federaci%C3%B3n_Espa%C3%B1ola_de_Actividades_Subacu%C3%A1ticas" title="Federación Española de Actividades Subacuáticas">Federación Española de Actividades Subacuáticas</a> (FEDAS)</li> <li><a href="/wiki/F%C3%A9d%C3%A9ration_Fran%C3%A7aise_d%27%C3%89tudes_et_de_Sports_Sous-Marins" title="Fédération Française d'Études et de Sports Sous-Marins">Fédération Française d'Études et de Sports Sous-Marins</a> (FFESSM)</li> <li><a href="/wiki/International_Association_for_Handicapped_Divers" title="International Association for Handicapped Divers">International Association for Handicapped Divers</a> (IAHD)</li> <li><a href="/wiki/Quintana_Roo_Speleological_Survey" title="Quintana Roo Speleological Survey">Quintana Roo Speleological Survey</a> (QRSS)</li> <li><a href="/wiki/Woodville_Karst_Plain_Project" title="Woodville Karst Plain Project">Woodville Karst Plain Project</a> (WKPP)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Diving tourism<br />industry</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Dive_center" title="Dive center">Dive center</a></li> <li><a href="/wiki/Diving_in_East_Timor" title="Diving in East Timor">Diving in East Timor</a></li> <li><a href="/wiki/Diving_in_the_Maldives" title="Diving in the Maldives">Diving in the Maldives</a></li> <li><a href="/wiki/Environmental_impact_of_recreational_diving" title="Environmental impact of recreational diving">Environmental impact of recreational diving</a></li> <li><a href="/wiki/Scuba_diving_tourism" title="Scuba diving tourism">Scuba diving tourism</a></li> <li><a href="/wiki/Scuba_diving_in_the_Cayman_Islands" title="Scuba diving in the Cayman Islands">Scuba diving in the Cayman Islands</a></li> <li><a href="/wiki/Shark_tourism" title="Shark tourism">Shark tourism</a></li> <li><a href="/wiki/Sinking_ships_for_wreck_diving_sites" title="Sinking ships for wreck diving sites">Sinking ships for wreck diving sites</a></li> <li><a href="/wiki/Underwater_diving_on_Guam" class="mw-redirect" title="Underwater diving on Guam">Underwater diving on Guam</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Diving events<br />and festivals</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diversnight" title="Diversnight">Diversnight</a></li> <li><a href="/wiki/Underwater_Bike_Race" title="Underwater Bike Race">Underwater Bike Race</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Diving_safety" style="font-size:114%;margin:0 4em"><a href="/wiki/Diving_safety" title="Diving safety">Diving safety</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Human_factors_in_diving_equipment_design" title="Human factors in diving equipment design">Human factors in diving equipment design</a></li> <li><a href="/wiki/Human_factors_in_diving_safety" title="Human factors in diving safety">Human factors in diving safety</a></li> <li><a href="/wiki/Life-support_system" title="Life-support system">Life-support system</a></li> <li><a href="/wiki/Safety-critical_system" title="Safety-critical system">Safety-critical system</a></li> <li><a href="/wiki/Scuba_diving_fatalities" title="Scuba diving fatalities">Scuba diving fatalities</a></li> <li><a href="/wiki/Underwater_diving_emergency" title="Underwater diving emergency">Underwater diving emergency</a></li> <li><a href="/wiki/Water_safety" title="Water safety">Water safety</a></li> <li><a href="/wiki/Water_surface_searches" title="Water surface searches">Water surface searches</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diving_hazards" title="Diving hazards">Diving<br />hazards</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_diving_hazards_and_precautions" title="List of diving hazards and precautions">List of diving hazards and precautions</a></li> <li><a href="/wiki/Hazards_of_the_diving_environment" class="mw-redirect" title="Hazards of the diving environment">Environmental</a> <ul><li><a href="/wiki/Ocean_current" title="Ocean current">Current</a></li> <li><a href="/wiki/Delta-P_(hazard)" class="mw-redirect" title="Delta-P (hazard)">Delta-P</a></li> <li><a href="/wiki/Entanglement_(hazard)" class="mw-redirect" title="Entanglement (hazard)">Entanglement hazard</a></li> <li><a href="/wiki/Penetration_diving" title="Penetration diving">Overhead</a></li> <li><a href="/wiki/Silt_out" title="Silt out">Silt out</a></li> <li><a href="/wiki/Wave_action" class="mw-redirect" title="Wave action">Wave action</a></li></ul></li> <li>Equipment <ul><li><a href="/wiki/Freeflow" title="Freeflow">Freeflow</a></li> <li><a href="/wiki/List_of_diving_hazards_and_precautions#Use_of_breathing_equipment_in_an_underwater_environment" title="List of diving hazards and precautions">Use of breathing equipment in an underwater environment</a></li> <li><a href="/wiki/List_of_diving_hazards_and_precautions#Failure_of_diving_equipment_other_than_breathing_apparatus" title="List of diving hazards and precautions">Failure of diving equipment other than breathing apparatus</a></li> <li><a href="/wiki/Single_point_of_failure" title="Single point of failure">Single point of failure</a></li></ul></li> <li>Physiological <ul><li><a href="/wiki/Cold_shock_response" title="Cold shock response">Cold shock response</a></li> <li><a href="/wiki/Decompression_(diving)" title="Decompression (diving)">Decompression</a></li> <li><a href="/wiki/Nitrogen_narcosis" title="Nitrogen narcosis">Nitrogen narcosis</a></li> <li><a href="/wiki/Oxygen_toxicity" title="Oxygen toxicity">Oxygen toxicity</a></li> <li><a href="/wiki/Seasickness" class="mw-redirect" title="Seasickness">Seasickness</a></li> <li><a href="/wiki/Uncontrolled_decompression" title="Uncontrolled decompression">Uncontrolled decompression</a></li></ul></li> <li><a href="/wiki/List_of_diving_hazards_and_precautions#Diver_behaviour_and_competence" title="List of diving hazards and precautions">Diver behaviour and competence</a> <ul><li>Lack of <a href="/wiki/Competence_(human_resources)" title="Competence (human resources)">competence</a></li> <li><a href="/wiki/Overconfidence_effect" title="Overconfidence effect">Overconfidence effect</a></li> <li><a href="/wiki/Panic" title="Panic">Panic</a></li> <li><a href="/wiki/Task_loading" title="Task loading">Task loading</a></li> <li><a href="/wiki/Anxiety#Trait" title="Anxiety">Trait anxiety</a></li> <li><a href="/wiki/Willful_violation" title="Willful violation">Willful violation</a></li></ul></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Consequences" scope="row" class="navbox-group" style="width:1%">Consequences</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Barotrauma" title="Barotrauma">Barotrauma</a></li> <li><a href="/wiki/Decompression_sickness" title="Decompression sickness">Decompression sickness</a></li> <li><a href="/wiki/Drowning" title="Drowning">Drowning</a></li> <li><a href="/wiki/Hypothermia" title="Hypothermia">Hypothermia</a></li> <li><a href="/wiki/Hypoxia_(medical)" class="mw-redirect" title="Hypoxia (medical)">Hypoxia</a></li> <li><a href="/wiki/Hypercapnia" title="Hypercapnia">Hypercapnia</a></li> <li><a href="/wiki/Hyperthermia" title="Hyperthermia">Hyperthermia</a></li> <li><a href="/wiki/Non-freezing_cold_injury" title="Non-freezing cold injury">Non-freezing cold injury</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diving_procedures" title="Diving procedures">Diving<br />procedures</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ascending_and_descending_(diving)" title="Ascending and descending (diving)">Ascending and descending</a> <ul><li><a href="/wiki/Emergency_ascent" title="Emergency ascent">Emergency ascent</a></li></ul></li> <li><a href="/wiki/Boat_diving" class="mw-redirect" title="Boat diving">Boat diving</a> <ul><li><a href="/wiki/Canoe_and_kayak_diving" title="Canoe and kayak diving">Canoe and kayak diving</a></li></ul></li> <li><a href="/wiki/Buddy_diving" title="Buddy diving">Buddy diving</a> <ul><li><a href="/wiki/Buddy_check" title="Buddy check">buddy check</a></li></ul></li> <li><a href="/wiki/Decompression_(diving)" title="Decompression (diving)">Decompression</a> <ul><li><a href="/wiki/Decompression_practice" title="Decompression practice">Decompression practice</a></li> <li><a href="/wiki/Pyle_stop" title="Pyle stop">Pyle stop</a></li> <li><a href="/wiki/Ratio_decompression" title="Ratio decompression">Ratio decompression</a></li></ul></li> <li><a href="/wiki/Dive_briefing" title="Dive briefing">Dive briefing</a></li> <li><a href="/wiki/Dive_log" title="Dive log">Dive log</a></li> <li><a href="/wiki/Dive_planning" title="Dive planning">Dive planning</a> <ul><li><a href="/wiki/Rule_of_thirds_(diving)" title="Rule of thirds (diving)">Rule of thirds</a></li> <li><a href="/wiki/Scuba_gas_planning" title="Scuba gas planning">Scuba gas planning</a></li></ul></li> <li><a href="/wiki/Diver_communications" title="Diver communications">Diver communications</a></li> <li><a href="/wiki/Diver_rescue" title="Diver rescue">Diver rescue</a></li> <li><a href="/wiki/Diver_training" title="Diver training">Diver training</a></li> <li><a href="/wiki/Doing_It_Right_(scuba_diving)" title="Doing It Right (scuba diving)">Doing It Right</a></li> <li><a href="/wiki/Drift_diving" title="Drift diving">Drift diving</a></li> <li><a href="/wiki/Gas_blending_for_scuba_diving" title="Gas blending for scuba diving">Gas blending for scuba diving</a></li> <li><a href="/wiki/Night_diving" title="Night diving">Night diving</a></li> <li><a href="/wiki/Rebreather_diving" title="Rebreather diving">Rebreather diving</a></li> <li><a href="/wiki/Scuba_gas_management" title="Scuba gas management">Scuba gas management</a></li> <li><a href="/wiki/Solo_diving" title="Solo diving">Solo diving</a></li> <li><a href="/wiki/Wall_diving" title="Wall diving">Wall diving</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Risk_management" title="Risk management">Risk<br />management</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Checklist" title="Checklist">Checklist</a></li> <li>Hazard identification and risk assessment <ul><li><a href="/wiki/Hazard_analysis" title="Hazard analysis">Hazard analysis</a></li> <li><a href="/wiki/Job_safety_analysis" title="Job safety analysis">Job safety analysis</a></li> <li><a href="/wiki/Risk_assessment" title="Risk assessment">Risk assessment</a></li></ul></li> <li><a href="/wiki/Hyperbaric_evacuation_and_rescue" title="Hyperbaric evacuation and rescue">Hyperbaric evacuation and rescue</a></li> <li><a href="/wiki/Risk_control" title="Risk control">Risk control</a> <ul><li><a href="/wiki/Hierarchy_of_hazard_controls" title="Hierarchy of hazard controls">Hierarchy of hazard controls</a></li></ul></li> <li><a href="/wiki/Incident_pit" title="Incident pit">Incident pit</a></li> <li><a href="/wiki/Lockout%E2%80%93tagout" title="Lockout–tagout">Lockout–tagout</a></li> <li><a href="/wiki/Permit_To_Work" class="mw-redirect" title="Permit To Work">Permit To Work</a></li> <li><a href="/wiki/Redundancy_(engineering)" title="Redundancy (engineering)">Redundancy</a></li> <li><a href="/wiki/Safety_data_sheet" title="Safety data sheet">Safety data sheet</a></li> <li><a href="/wiki/Situation_awareness" title="Situation awareness">Situation awareness</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diving_team" title="Diving team">Diving team</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bellman_(diving)" class="mw-redirect" title="Bellman (diving)">Bellman</a></li> <li><a href="/wiki/Chamber_operator" class="mw-redirect" title="Chamber operator">Chamber operator</a></li> <li><a href="/wiki/Diver_medical_technician" class="mw-redirect" title="Diver medical technician">Diver medical technician</a></li> <li><a href="/wiki/Diver%27s_attendant" class="mw-redirect" title="Diver's attendant">Diver's attendant</a></li> <li><a href="/wiki/Diving_supervisor" title="Diving supervisor">Diving supervisor</a></li> <li><a href="/wiki/Diving_systems_technician" class="mw-redirect" title="Diving systems technician">Diving systems technician</a></li> <li><a href="/wiki/Gas_man" class="mw-redirect" title="Gas man">Gas man</a></li> <li><a href="/wiki/Life_support_technician" class="mw-redirect" title="Life support technician">Life support technician</a></li> <li><a href="/wiki/Stand-by_diver" class="mw-redirect" title="Stand-by diver">Stand-by diver</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Equipment<br />safety</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Breathing_gas_quality" class="mw-redirect" title="Breathing gas quality">Breathing gas quality</a></li> <li><a href="/wiki/Testing_and_inspection_of_diving_cylinders" title="Testing and inspection of diving cylinders">Testing and inspection of diving cylinders</a> <ul><li><a href="/wiki/Hydrostatic_test" title="Hydrostatic test">Hydrostatic test</a></li> <li><a href="/wiki/Sustained_load_cracking" title="Sustained load cracking">Sustained load cracking</a></li></ul></li> <li><a href="/wiki/Diving_regulator" title="Diving regulator">Diving regulator</a> <ul><li><a href="/wiki/Breathing_performance_of_regulators" title="Breathing performance of regulators">Breathing performance of regulators</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Occupational_safety_and_health" title="Occupational safety and health">Occupational<br />safety and<br />health</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Association_of_Diving_Contractors_International" title="Association of Diving Contractors International">Association of Diving Contractors International</a></li> <li><a href="/wiki/International_Marine_Contractors_Association" title="International Marine Contractors Association">International Marine Contractors Association</a></li> <li><a href="/wiki/Code_of_practice" title="Code of practice">Code of practice</a></li> <li><a href="/wiki/Contingency_plan" title="Contingency plan">Contingency plan</a></li> <li><a href="/wiki/Diving_regulations" title="Diving regulations">Diving regulations</a></li> <li><a href="/wiki/Emergency_response_plan" class="mw-redirect" title="Emergency response plan">Emergency response plan</a></li> <li><a href="/wiki/Diving_safety_officer" title="Diving safety officer">Diving safety officer</a></li> <li><a href="/wiki/Diving_superintendent" class="mw-redirect" title="Diving superintendent">Diving superintendent</a></li> <li><a href="/wiki/Diving_supervisor" title="Diving supervisor">Diving supervisor</a></li> <li><a href="/wiki/Operations_manual" title="Operations manual">Operations manual</a></li> <li><a href="/wiki/Standard_operating_procedure" title="Standard operating procedure">Standard operating procedure</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Diving_medicine" style="font-size:114%;margin:0 4em"><a href="/wiki/Diving_medicine" title="Diving medicine">Diving medicine</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diving_disorders" title="Diving disorders">Diving<br />disorders</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_signs_and_symptoms_of_diving_disorders" title="List of signs and symptoms of diving disorders">List of signs and symptoms of diving disorders</a></li> <li><a href="/wiki/Cramp" title="Cramp">Cramp</a></li> <li><a href="/wiki/Motion_sickness" title="Motion sickness">Motion sickness</a></li> <li><a href="/wiki/Surfer%27s_ear" title="Surfer's ear">Surfer's ear</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Pressure<br />related</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alternobaric_vertigo" title="Alternobaric vertigo">Alternobaric vertigo</a></li> <li><a href="/wiki/Barostriction" class="mw-redirect" title="Barostriction">Barostriction</a></li> <li><a href="/wiki/Barotrauma" title="Barotrauma">Barotrauma</a> <ul><li><a href="/wiki/Air_embolism" title="Air embolism">Air embolism</a></li> <li><a href="/wiki/Aerosinusitis" title="Aerosinusitis">Aerosinusitis</a></li> <li><a href="/wiki/Barodontalgia" title="Barodontalgia">Barodontalgia</a></li> <li><a href="/wiki/Dental_barotrauma" class="mw-redirect" title="Dental barotrauma">Dental barotrauma</a></li> <li><a href="/wiki/Middle_ear_barotrauma" title="Middle ear barotrauma">Middle ear barotrauma</a></li> <li><a href="/wiki/Pulmonary_barotrauma" class="mw-redirect" title="Pulmonary barotrauma">Pulmonary barotrauma</a></li></ul></li> <li><a href="/wiki/Compression_arthralgia" title="Compression arthralgia">Compression arthralgia</a></li> <li><a href="/wiki/Decompression_illness" title="Decompression illness">Decompression illness</a></li> <li><a href="/wiki/Dysbarism" title="Dysbarism">Dysbarism</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Oxygen</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Freediving_blackout" title="Freediving blackout">Freediving blackout</a></li> <li><a href="/wiki/Hyperoxia" title="Hyperoxia">Hyperoxia</a></li> <li><a href="/wiki/Hypoxia_(medical)" class="mw-redirect" title="Hypoxia (medical)">Hypoxia</a></li> <li><a href="/wiki/Oxygen_toxicity" title="Oxygen toxicity">Oxygen toxicity</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Inert gases</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Avascular_necrosis" title="Avascular necrosis">Avascular necrosis</a></li> <li><a href="/wiki/Decompression_sickness" title="Decompression sickness">Decompression sickness</a> <ul><li><a href="/wiki/Dysbaric_osteonecrosis" title="Dysbaric osteonecrosis">Dysbaric osteonecrosis</a></li> <li><a href="/wiki/Inner_ear_decompression_sickness" title="Inner ear decompression sickness">Inner ear decompression sickness</a></li> <li><a href="/wiki/Isobaric_counterdiffusion" title="Isobaric counterdiffusion">Isobaric counterdiffusion</a></li> <li><a href="/wiki/Taravana" title="Taravana">Taravana</a></li></ul></li> <li><a href="/wiki/High-pressure_nervous_syndrome" title="High-pressure nervous syndrome">High-pressure nervous syndrome</a></li> <li><a href="/wiki/Hydrogen_narcosis" title="Hydrogen narcosis">Hydrogen narcosis</a></li> <li><a href="/wiki/Nitrogen_narcosis" title="Nitrogen narcosis">Nitrogen narcosis</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Carbon dioxide</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Hypercapnia" title="Hypercapnia">Hypercapnia</a></li> <li><a href="/wiki/Hypocapnia" title="Hypocapnia">Hypocapnia</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Breathing gas<br />contaminants</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Carbon_monoxide_poisoning" title="Carbon monoxide poisoning">Carbon monoxide poisoning</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Immersion<br />related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Asphyxia" title="Asphyxia">Asphyxia</a></li> <li><a href="/wiki/Drowning" title="Drowning">Drowning</a></li> <li><a href="/wiki/Hypothermia" title="Hypothermia">Hypothermia</a></li> <li><a href="/wiki/Immersion_diuresis" class="mw-redirect" title="Immersion diuresis">Immersion diuresis</a></li> <li><a href="/wiki/Instinctive_drowning_response" title="Instinctive drowning response">Instinctive drowning response</a></li> <li><a href="/wiki/Laryngospasm" title="Laryngospasm">Laryngospasm</a></li> <li><a href="/wiki/Salt_water_aspiration_syndrome" title="Salt water aspiration syndrome">Salt water aspiration syndrome</a></li> <li><a href="/wiki/Swimming-induced_pulmonary_edema" title="Swimming-induced pulmonary edema">Swimming-induced pulmonary edema</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Treatment</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Demand_valve_oxygen_therapy" title="Demand valve oxygen therapy">Demand valve oxygen therapy</a></li> <li><a href="/wiki/First_aid" title="First aid">First aid</a></li> <li><a href="/wiki/Hyperbaric_medicine" title="Hyperbaric medicine">Hyperbaric medicine</a></li> <li><a href="/wiki/Hyperbaric_treatment_schedules" title="Hyperbaric treatment schedules">Hyperbaric treatment schedules</a></li> <li><a href="/wiki/In-water_recompression" title="In-water recompression">In-water recompression</a></li> <li><a href="/wiki/Oxygen_therapy" title="Oxygen therapy">Oxygen therapy</a></li> <li><a href="/wiki/Therapeutic_recompression" class="mw-redirect" title="Therapeutic recompression">Therapeutic recompression</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Personnel</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diving_Medical_Examiner" class="mw-redirect" title="Diving Medical Examiner">Diving Medical Examiner</a></li> <li><a href="/wiki/Diving_Medical_Practitioner" class="mw-redirect" title="Diving Medical Practitioner">Diving Medical Practitioner</a></li> <li><a href="/wiki/Diving_Medical_Technician" class="mw-redirect" title="Diving Medical Technician">Diving Medical Technician</a></li> <li><a href="/wiki/Hyperbaric_nursing" title="Hyperbaric nursing">Hyperbaric nursing</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Screening</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Atrial_septal_defect" title="Atrial septal defect">Atrial septal defect</a></li> <li><a href="/wiki/Effects_of_drugs_on_fitness_to_dive" class="mw-redirect" title="Effects of drugs on fitness to dive">Effects of drugs on fitness to dive</a></li> <li><a href="/wiki/Fitness_to_dive" title="Fitness to dive">Fitness to dive</a></li> <li><a href="/wiki/Psychological_fitness_to_dive" class="mw-redirect" title="Psychological fitness to dive">Psychological fitness to dive</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Research</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_researchers_in_diving_physiology_and_medicine" class="mw-redirect" title="List of researchers in diving physiology and medicine">Researchers in<br />diving physiology<br />and medicine</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Arthur_J._Bachrach" title="Arthur J. Bachrach">Arthur J. Bachrach</a></li> <li><a href="/wiki/Albert_R._Behnke" title="Albert R. Behnke">Albert R. Behnke</a></li> <li><a href="/wiki/Peter_B._Bennett" title="Peter B. Bennett">Peter B. Bennett</a></li> <li><a href="/wiki/Paul_Bert" title="Paul Bert">Paul Bert</a></li> <li><a href="/wiki/George_F._Bond" title="George F. Bond">George F. Bond</a></li> <li><a href="/wiki/Robert_Boyle" title="Robert Boyle">Robert Boyle</a></li> <li><a href="/wiki/Alf_O._Brubakk" title="Alf O. Brubakk">Alf O. Brubakk</a></li> <li><a href="/wiki/Albert_A._B%C3%BChlmann" title="Albert A. Bühlmann">Albert A. Bühlmann</a></li> <li><a href="/wiki/John_R._Clarke_(scientist)" title="John R. Clarke (scientist)">John R. Clarke</a></li> <li><a href="/wiki/Guybon_Chesney_Castell_Damant" title="Guybon Chesney Castell Damant">Guybon Chesney Castell Damant</a></li> <li><a href="/wiki/Kenneth_William_Donald" title="Kenneth William Donald">Kenneth William Donald</a></li> <li><a href="/wiki/William_Paul_Fife" title="William Paul Fife">William Paul Fife</a></li> <li><a href="/wiki/John_Scott_Haldane" title="John Scott Haldane">John Scott Haldane</a></li> <li><a href="/wiki/Robert_William_Hamilton_Jr." title="Robert William Hamilton Jr.">Robert William Hamilton Jr.</a></li> <li><a href="/wiki/Henry_Valence_Hempleman" title="Henry Valence Hempleman">Henry Valence Hempleman</a></li> <li><a href="/wiki/Leonard_Erskine_Hill" class="mw-redirect" title="Leonard Erskine Hill">Leonard Erskine Hill</a></li> <li><a href="/wiki/Brian_Andrew_Hills" title="Brian Andrew Hills">Brian Andrew Hills</a></li> <li><a href="/wiki/Felix_Hoppe-Seyler" title="Felix Hoppe-Seyler">Felix Hoppe-Seyler</a></li> <li><a href="/wiki/Christian_J._Lambertsen" title="Christian J. Lambertsen">Christian J. Lambertsen</a></li> <li><a href="/wiki/Simon_Mitchell" title="Simon Mitchell">Simon Mitchell</a></li> <li><a href="/wiki/Charles_Momsen" title="Charles Momsen">Charles Momsen</a></li> <li><a href="/wiki/Neal_W._Pollock" title="Neal W. Pollock">Neal W. Pollock</a></li> <li><a href="/wiki/John_Rawlins_(Royal_Navy_officer)" title="John Rawlins (Royal Navy officer)">John Rawlins</a></li> <li><a href="/wiki/Charles_Wesley_Shilling" title="Charles Wesley Shilling">Charles Wesley Shilling</a></li> <li><a href="/wiki/Edward_D._Thalmann" title="Edward D. Thalmann">Edward D. Thalmann</a></li> <li><a href="/wiki/Jacques_Triger" title="Jacques Triger">Jacques Triger</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Diving medical<br />research<br />organisations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aerospace_Medical_Association" title="Aerospace Medical Association">Aerospace Medical Association</a></li> <li><a href="/wiki/Divers_Alert_Network" title="Divers Alert Network">Divers Alert Network</a> (DAN)</li> <li><a href="/wiki/Diving_Diseases_Research_Centre" class="mw-redirect" title="Diving Diseases Research Centre">Diving Diseases Research Centre</a> (DDRC)</li> <li><a href="/wiki/Diving_Medical_Advisory_Council" title="Diving Medical Advisory Council">Diving Medical Advisory Council</a> (DMAC)</li> <li><a href="/wiki/European_Diving_Technology_Committee" title="European Diving Technology Committee">European Diving Technology Committee</a> (EDTC)</li> <li><a href="/wiki/European_Underwater_and_Baromedical_Society" title="European Underwater and Baromedical Society">European Underwater and Baromedical Society</a> (EUBS)</li> <li><a href="/wiki/National_Board_of_Diving_and_Hyperbaric_Medical_Technology" title="National Board of Diving and Hyperbaric Medical Technology">National Board of Diving and Hyperbaric Medical Technology</a></li> <li><a href="/wiki/Naval_Submarine_Medical_Research_Laboratory" title="Naval Submarine Medical Research Laboratory">Naval Submarine Medical Research Laboratory</a></li> <li><a href="/wiki/Royal_Australian_Navy_School_of_Underwater_Medicine" title="Royal Australian Navy School of Underwater Medicine">Royal Australian Navy School of Underwater Medicine</a></li> <li><a href="/wiki/Rubicon_Foundation" title="Rubicon Foundation">Rubicon Foundation</a></li> <li><a href="/wiki/South_Pacific_Underwater_Medicine_Society" title="South Pacific Underwater Medicine Society">South Pacific Underwater Medicine Society</a> (SPUMS)</li> <li><a href="/wiki/Southern_African_Underwater_and_Hyperbaric_Medical_Association" title="Southern African Underwater and Hyperbaric Medical Association">Southern African Underwater and Hyperbaric Medical Association</a> (SAUHMA)</li> <li><a href="/wiki/Undersea_and_Hyperbaric_Medical_Society" title="Undersea and Hyperbaric Medical Society">Undersea and Hyperbaric Medical Society</a> (UHMS)</li> <li><a href="/wiki/United_States_Navy_Experimental_Diving_Unit" title="United States Navy Experimental Diving Unit">United States Navy Experimental Diving Unit</a> (NEDU)</li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Law" style="font-size:114%;margin:0 4em">Law</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Civil_liability_in_recreational_diving" title="Civil liability in recreational diving">Civil liability in recreational diving</a></li> <li><a href="/wiki/Diving_regulations" title="Diving regulations">Diving regulations</a></li> <li><a href="/wiki/Duty_of_care" title="Duty of care">Duty of care</a></li> <li><a href="/wiki/List_of_legislation_regulating_underwater_diving" title="List of legislation regulating underwater diving">List of legislation regulating underwater diving</a></li> <li><a href="/wiki/Investigation_of_diving_accidents" title="Investigation of diving accidents">Investigation of diving accidents</a></li> <li><a href="/wiki/Convention_on_the_Protection_of_the_Underwater_Cultural_Heritage" title="Convention on the Protection of the Underwater Cultural Heritage">Convention on the Protection of the Underwater Cultural Heritage</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="History_of_underwater_diving" style="font-size:114%;margin:0 4em"><a href="/wiki/History_of_underwater_diving" title="History of underwater diving">History of underwater diving</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/History_of_decompression_research_and_development" title="History of decompression research and development">History of decompression research and development</a></li> <li><a href="/wiki/History_of_dive_computers" class="mw-redirect" title="History of dive computers">History of dive computers</a></li> <li><a href="/wiki/History_of_Diving_Museum" title="History of Diving Museum">History of Diving Museum</a></li> <li><a href="/wiki/History_of_scuba_diving" title="History of scuba diving">History of scuba diving</a></li> <li><a href="/wiki/List_of_researchers_in_underwater_diving" title="List of researchers in underwater diving">List of researchers in underwater diving</a></li> <li><a href="/wiki/Lyons_Maritime_Museum" title="Lyons Maritime Museum">Lyons Maritime Museum</a></li> <li><a href="/wiki/Man_in_the_Sea_Museum" title="Man in the Sea Museum">Man in the Sea Museum</a></li> <li><a href="/wiki/Timeline_of_atmospheric_diving_suits" class="mw-redirect" title="Timeline of atmospheric diving suits">Timeline of atmospheric diving suits</a></li> <li><a href="/wiki/Timeline_of_diving_technology" title="Timeline of diving technology">Timeline of diving technology</a></li> <li><a href="/wiki/Pearling_in_Western_Australia" title="Pearling in Western Australia">Pearling in Western Australia</a></li> <li><a href="/wiki/US_Navy_decompression_models_and_tables" title="US Navy decompression models and tables">US Navy decompression models and tables</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Archeological<br />sites</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/SS_Commodore" title="SS Commodore">SS <i>Commodore</i></a></li> <li><a href="/wiki/USS_Monitor" title="USS Monitor">USS <i>Monitor</i></a></li> <li><i><a href="/wiki/Queen_Anne%27s_Revenge" title="Queen Anne's Revenge">Queen Anne's Revenge</a></i></li> <li><i><a href="/wiki/Whydah_Gally" title="Whydah Gally">Whydah Gally</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Underwater art<br />and artists</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/The_Diver" title="The Diver">The Diver</a></li> <li><a href="/wiki/Jason_deCaires_Taylor" title="Jason deCaires Taylor">Jason deCaires Taylor</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Engineers<br />and inventors</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Jer%C3%B3nimo_de_Ayanz_y_Beaumont" title="Jerónimo de Ayanz y Beaumont">Jerónimo de Ayanz y Beaumont</a></li> <li><a href="/wiki/William_Beebe" title="William Beebe">William Beebe</a></li> <li><a href="/wiki/Georges_Beuchat" title="Georges Beuchat">Georges Beuchat</a></li> <li><a href="/wiki/Giovanni_Alfonso_Borelli" title="Giovanni Alfonso Borelli">Giovanni Alfonso Borelli</a></li> <li><a href="/wiki/Joseph-Martin_Cabirol" title="Joseph-Martin Cabirol">Joseph-Martin Cabirol</a></li> <li><a href="/wiki/John_R._Clarke_(scientist)" title="John R. Clarke (scientist)">John R. Clarke</a></li> <li><a href="/wiki/Jacques_Cousteau" title="Jacques Cousteau">Jacques Cousteau</a></li> <li><a href="/wiki/Charles_Anthony_Deane" title="Charles Anthony Deane">Charles Anthony Deane</a></li> <li><a href="/wiki/John_Deane_(inventor)" title="John Deane (inventor)">John Deane</a></li> <li><a href="/wiki/Louis_de_Corlieu" title="Louis de Corlieu">Louis de Corlieu</a></li> <li><a href="/wiki/Auguste_Denayrouze" title="Auguste Denayrouze">Auguste Denayrouze</a></li> <li><a href="/wiki/Ted_Eldred" title="Ted Eldred">Ted Eldred</a></li> <li><a href="/wiki/Henry_Fleuss" title="Henry Fleuss">Henry Fleuss</a></li> <li><a href="/wiki/%C3%89mile_Gagnan" title="Émile Gagnan">Émile Gagnan</a></li> <li><a href="/wiki/Karl_Heinrich_Klingert" title="Karl Heinrich Klingert">Karl Heinrich Klingert</a></li> <li><a href="/wiki/Peter_Kreeft_(diver)" title="Peter Kreeft (diver)">Peter Kreeft</a></li> <li><a href="/wiki/Christian_J._Lambertsen" title="Christian J. Lambertsen">Christian J. Lambertsen</a></li> <li><a href="/wiki/Yves_Le_Prieur" title="Yves Le Prieur">Yves Le Prieur</a></li> <li><a href="/wiki/John_Lethbridge" title="John Lethbridge">John Lethbridge</a></li> <li><a href="/wiki/Ernest_William_Moir" title="Ernest William Moir">Ernest William Moir</a></li> <li><a href="/wiki/Joseph_Salim_Peress" title="Joseph Salim Peress">Joseph Salim Peress</a></li> <li><a href="/wiki/Auguste_Piccard" title="Auguste Piccard">Auguste Piccard</a></li> <li><a href="/wiki/Joe_Savoie" title="Joe Savoie">Joe Savoie</a></li> <li><a href="/wiki/Willard_Franklyn_Searle" title="Willard Franklyn Searle">Willard Franklyn Searle</a></li> <li><a href="/wiki/Gordon_Smith_(inventor)" title="Gordon Smith (inventor)">Gordon Smith</a></li> <li><a href="/wiki/Augustus_Siebe" title="Augustus Siebe">Augustus Siebe</a></li> <li><a href="/wiki/Pierre-Marie_Touboulic" title="Pierre-Marie Touboulic">Pierre-Marie Touboulic</a></li> <li><a href="/wiki/Jacques_Triger" title="Jacques Triger">Jacques Triger</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Historical<br />equipment</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aqua-Lung" title="Aqua-Lung">Aqua-Lung</a></li> <li><a href="/wiki/RV_Calypso" title="RV Calypso">RV <i>Calypso</i></a></li> <li><a href="/wiki/SP-350_Denise" title="SP-350 Denise">SP-350 <i>Denise</i></a></li> <li><a href="/wiki/Magnesium_torch" title="Magnesium torch">Magnesium torch</a></li> <li><a href="/wiki/Nikonos" title="Nikonos">Nikonos</a></li> <li><a href="/wiki/Porpoise_(scuba_gear)" title="Porpoise (scuba gear)">Porpoise regulator</a></li> <li><a href="/wiki/Standard_diving_dress" title="Standard diving dress">Standard diving dress</a></li> <li><a href="/wiki/Sub_Marine_Explorer" title="Sub Marine Explorer">Sub Marine Explorer</a></li> <li><a href="/wiki/Vintage_scuba" title="Vintage scuba">Vintage scuba</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Diverpropulsionvehicles" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diver_propulsion_vehicle" title="Diver propulsion vehicle">Diver<br />propulsion<br />vehicles</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Advanced_SEAL_Delivery_System" title="Advanced SEAL Delivery System">Advanced SEAL Delivery System</a></li> <li><a href="/wiki/Cosmos_CE2F_series" title="Cosmos CE2F series">Cosmos CE2F series</a></li> <li><a href="/wiki/Dry_Combat_Submersible" title="Dry Combat Submersible">Dry Combat Submersible</a></li> <li><a href="/wiki/Human_torpedo" title="Human torpedo">Human torpedo</a></li> <li><a href="/wiki/Motorised_Submersible_Canoe" title="Motorised Submersible Canoe">Motorised Submersible Canoe</a></li> <li><a href="/wiki/Necker_Nymph" title="Necker Nymph">Necker Nymph</a></li> <li><a href="/wiki/R-2_Mala-class_swimmer_delivery_vehicle" title="R-2 Mala-class swimmer delivery vehicle">R-2 Mala-class swimmer delivery vehicle</a></li> <li><a href="/wiki/SEAL_Delivery_Vehicle" title="SEAL Delivery Vehicle">SEAL Delivery Vehicle</a></li> <li><a href="/wiki/Shallow_Water_Combat_Submersible" title="Shallow Water Combat Submersible">Shallow Water Combat Submersible</a></li> <li><a href="/wiki/Siluro_San_Bartolomeo" title="Siluro San Bartolomeo">Siluro San Bartolomeo</a></li> <li><a href="/wiki/Welfreighter" title="Welfreighter">Welfreighter</a></li> <li><a href="/wiki/Wet_Nellie" title="Wet Nellie">Wet Nellie</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Military and<br />covert operations</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Raid_on_Alexandria_(1941)" title="Raid on Alexandria (1941)">Raid on Alexandria (1941)</a></li> <li><a href="/wiki/Sinking_of_the_Rainbow_Warrior" title="Sinking of the Rainbow Warrior">Sinking of the <i>Rainbow Warrior</i></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Scientific projects</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/1992_cageless_shark-diving_expedition" title="1992 cageless shark-diving expedition">1992 cageless shark-diving expedition</a></li> <li><a href="/wiki/Mission_31" title="Mission 31">Mission 31</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Awards and events</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Hans_Hass_Award" title="Hans Hass Award">Hans Hass Award</a></li> <li><a href="/wiki/International_Scuba_Diving_Hall_of_Fame" title="International Scuba Diving Hall of Fame">International Scuba Diving Hall of Fame</a></li> <li><a href="/wiki/London_Diving_Chamber_Dive_Lectures" title="London Diving Chamber Dive Lectures">London Diving Chamber Dive Lectures</a></li> <li><a href="/wiki/NOGI_Awards" title="NOGI Awards">NOGI Awards</a></li> <li><a href="/wiki/Women_Divers_Hall_of_Fame" title="Women Divers Hall of Fame">Women Divers Hall of Fame</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Incidents</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Dive_boat" title="Dive boat">Dive boat</a> incidents</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sinking_of_MV_Conception" title="Sinking of MV Conception">Sinking of MV <i>Conception</i></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Diver rescues</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alpazat_cave_rescue" title="Alpazat cave rescue">Alpazat cave rescue</a></li> <li><a href="/wiki/Tham_Luang_cave_rescue" title="Tham Luang cave rescue">Tham Luang cave rescue</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Early diving</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/John_Day_(carpenter)" title="John Day (carpenter)">John Day (carpenter)</a></li> <li><a href="/wiki/Charles_Spalding" title="Charles Spalding">Charles Spalding</a></li> <li><a href="/wiki/Ebenezer_Watson" class="mw-redirect" title="Ebenezer Watson">Ebenezer Watson</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Freediving" title="Freediving">Freediving</a> fatalities</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Stephen_Keenan" title="Stephen Keenan">Stephen Keenan</a></li> <li><a href="/wiki/Lo%C3%AFc_Leferme" title="Loïc Leferme">Loïc Leferme</a></li> <li><a href="/wiki/Audrey_Mestre" title="Audrey Mestre">Audrey Mestre</a></li> <li><a href="/wiki/Nicholas_Mevoli" title="Nicholas Mevoli">Nicholas Mevoli</a></li> <li><a href="/wiki/Natalia_Molchanova" title="Natalia Molchanova">Natalia Molchanova</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Offshore_diving" class="mw-redirect" title="Offshore diving">Offshore<br />diving</a> incidents</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Byford_Dolphin#Diving_bell_accident" title="Byford Dolphin"><i>Byford Dolphin</i> diving bell accident</a></li> <li><a href="/wiki/Drill_Master_diving_accident" title="Drill Master diving accident"><i>Drill Master</i> diving accident</a></li> <li><a href="/wiki/Star_Canopus_diving_accident" title="Star Canopus diving accident"><i>Star Canopus</i> diving accident</a></li> <li><a href="/wiki/Stena_Seaspread_diving_accident" title="Stena Seaspread diving accident"><i>Stena Seaspread</i> diving accident</a></li> <li><a href="/wiki/Venture_One_diving_accident" class="mw-redirect" title="Venture One diving accident"><i>Venture One</i> diving accident</a></li> <li><a href="/wiki/Waage_Drill_II_diving_accident" title="Waage Drill II diving accident"><i>Waage Drill II</i> diving accident</a></li> <li><a href="/wiki/Wildrake_diving_accident" title="Wildrake diving accident"><i>Wildrake</i> diving accident</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Professional_diving" title="Professional diving">Professional<br />diving</a> fatalities</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Roger_Baldwin_(diver)" class="mw-redirect" title="Roger Baldwin (diver)">Roger Baldwin</a></li> <li><a href="/wiki/John_Bennett_(diver)" title="John Bennett (diver)">John Bennett</a></li> <li><a href="/wiki/Victor_F._Guiel_Jr." class="mw-redirect" title="Victor F. Guiel Jr.">Victor F. Guiel Jr.</a></li> <li><a href="/wiki/Francis_P._Hammerberg" title="Francis P. Hammerberg">Francis P. Hammerberg</a></li> <li><a href="/wiki/Craig_M._Hoffman" class="mw-redirect" title="Craig M. Hoffman">Craig M. Hoffman</a></li> <li><a href="/wiki/Peter_Henry_Michael_Holmes" class="mw-redirect" title="Peter Henry Michael Holmes">Peter Henry Michael Holmes</a></li> <li><a href="/wiki/Johnson_Sea_Link_accident" title="Johnson Sea Link accident">Johnson Sea Link accident</a> <ul><li><a href="/wiki/Edwin_Clayton_Link" class="mw-redirect" title="Edwin Clayton Link">Edwin Clayton Link</a></li></ul></li> <li><a href="/wiki/Gerard_Anthony_Prangley" class="mw-redirect" title="Gerard Anthony Prangley">Gerard Anthony Prangley</a></li> <li><a href="/wiki/Per_Skipnes" class="mw-redirect" title="Per Skipnes">Per Skipnes</a></li> <li><a href="/wiki/Robert_John_Smyth" class="mw-redirect" title="Robert John Smyth">Robert John Smyth</a></li> <li><a href="/wiki/Albert_D._Stover" class="mw-redirect" title="Albert D. Stover">Albert D. Stover</a></li> <li><a href="/wiki/Richard_A._Walker" class="mw-redirect" title="Richard A. Walker">Richard A. Walker</a></li> <li><a href="/wiki/Lothar_Michael_Ward" class="mw-redirect" title="Lothar Michael Ward">Lothar Michael Ward</a></li> <li><a href="/wiki/Joachim_Wendler" title="Joachim Wendler">Joachim Wendler</a></li> <li><a href="/wiki/Death_of_Bradley_Westell" title="Death of Bradley Westell">Bradley Westell</a></li> <li><a href="/wiki/Arne_Zetterstr%C3%B6m" title="Arne Zetterström">Arne Zetterström</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Scuba_diving_fatalities" title="Scuba diving fatalities">Scuba diving<br />fatalities</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/1973_Mount_Gambier_cave_diving_accident" title="1973 Mount Gambier cave diving accident">1973 Mount Gambier cave diving accident</a></li> <li><a href="/wiki/Ricardo_Armbruster" title="Ricardo Armbruster">Ricardo Armbruster</a></li> <li><a href="/wiki/Allan_Bridge" title="Allan Bridge">Allan Bridge</a></li> <li><a href="/wiki/David_Bright_(diver)" title="David Bright (diver)">David Bright</a></li> <li><a href="/wiki/Berry_L._Cannon" title="Berry L. Cannon">Berry L. Cannon</a></li> <li><a href="/wiki/Cotton_Coulson" title="Cotton Coulson">Cotton Coulson</a></li> <li><a href="/wiki/Cl%C3%A1udio_Coutinho" title="Cláudio Coutinho">Cláudio Coutinho</a></li> <li><a href="/wiki/E._Yale_Dawson" title="E. Yale Dawson">E. Yale Dawson</a></li> <li><a href="/wiki/Deon_Dreyer" title="Deon Dreyer">Deon Dreyer</a></li> <li><a href="/wiki/Milan_Dufek" title="Milan Dufek">Milan Dufek</a></li> <li><a href="/wiki/Sheck_Exley" title="Sheck Exley">Sheck Exley</a></li> <li><a href="/wiki/Maurice_Fargues" title="Maurice Fargues">Maurice Fargues</a></li> <li><a href="/wiki/Fernando_Garfella_Palmer" title="Fernando Garfella Palmer">Fernando Garfella Palmer</a></li> <li><a href="/wiki/Guy_Garman" title="Guy Garman">Guy Garman</a></li> <li><a href="/wiki/Steve_Irwin" title="Steve Irwin">Steve Irwin</a> <ul><li><a href="/wiki/Death_of_Steve_Irwin" title="Death of Steve Irwin">death</a></li></ul></li> <li><a href="/wiki/Jim_Jones_(American_football,_born_1935)" title="Jim Jones (American football, born 1935)">Jim Jones</a></li> <li><a href="/wiki/Henry_Way_Kendall" title="Henry Way Kendall">Henry Way Kendall</a></li> <li><a href="/wiki/Artur_Koz%C5%82owski_(speleologist)" title="Artur Kozłowski (speleologist)">Artur Kozłowski</a></li> <li><a href="/wiki/Yuri_Lipski" class="mw-redirect" title="Yuri Lipski">Yuri Lipski</a></li> <li><a href="/wiki/Kirsty_MacColl" title="Kirsty MacColl">Kirsty MacColl</a></li> <li><a href="/wiki/Death_of_Linnea_Mills" title="Death of Linnea Mills">Linnea Mills</a></li> <li><a href="/wiki/Agnes_Milowka" title="Agnes Milowka">Agnes Milowka</a></li> <li><a href="/wiki/Fran%C3%A7ois_de_Roubaix" title="François de Roubaix">François de Roubaix</a></li> <li><a href="/wiki/The_Last_Dive" title="The Last Dive">Chris and Chrissy Rouse</a></li> <li><a href="/wiki/Dave_Shaw" title="Dave Shaw">Dave Shaw</a></li> <li><a href="/wiki/Wesley_C._Skiles" title="Wesley C. Skiles">Wesley C. Skiles</a></li> <li><a href="/wiki/Dewey_Smith" title="Dewey Smith">Dewey Smith</a></li> <li><a href="/wiki/Rob_Stewart_(filmmaker)" title="Rob Stewart (filmmaker)">Rob Stewart</a></li> <li><a href="/wiki/Esbj%C3%B6rn_Svensson" title="Esbjörn Svensson">Esbjörn Svensson</a></li> <li><a href="/wiki/Josef_Velek" title="Josef Velek">Josef Velek</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Publications" style="font-size:114%;margin:0 4em">Publications</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Manuals</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/NOAA_Diving_Manual" title="NOAA Diving Manual">NOAA Diving Manual</a></i></li> <li><i><a href="/wiki/U.S._Navy_Diving_Manual" title="U.S. Navy Diving Manual">U.S. Navy Diving Manual</a></i></li> <li><i><a href="/wiki/Basic_Cave_Diving:_A_Blueprint_for_Survival" title="Basic Cave Diving: A Blueprint for Survival">Basic Cave Diving: A Blueprint for Survival</a></i></li> <li><i><a href="/w/index.php?title=Underwater_Handbook&action=edit&redlink=1" class="new" title="Underwater Handbook (page does not exist)">Underwater Handbook</a></i></li> <li><i><a href="/w/index.php?title=Bennett_and_Elliott%27s_physiology_and_medicine_of_diving&action=edit&redlink=1" class="new" title="Bennett and Elliott's physiology and medicine of diving (page does not exist)">Bennett and Elliott's physiology and medicine of diving</a></i></li> <li><i><a href="/w/index.php?title=Encyclopedia_of_Recreational_Diving&action=edit&redlink=1" class="new" title="Encyclopedia of Recreational Diving (page does not exist)">Encyclopedia of Recreational Diving</a></i></li> <li><i><a href="/w/index.php?title=The_new_science_of_skin_and_scuba_diving&action=edit&redlink=1" class="new" title="The new science of skin and scuba diving (page does not exist)">The new science of skin and scuba diving</a></i></li> <li><i><a href="/w/index.php?title=Professional_Diver%27s_Handbook&action=edit&redlink=1" class="new" title="Professional Diver's Handbook (page does not exist)">Professional Diver's Handbook</a></i></li> <li><i><a href="/w/index.php?title=Basic_Scuba&action=edit&redlink=1" class="new" title="Basic Scuba (page does not exist)">Basic Scuba</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Standards and<br />Codes of Practice</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Code_of_Practice_for_Scientific_Diving_(UNESCO)" class="mw-redirect" title="Code of Practice for Scientific Diving (UNESCO)">Code of Practice for Scientific Diving (UNESCO)</a></li> <li><a href="/wiki/DIN_7876" title="DIN 7876">DIN 7876</a></li> <li><a href="/wiki/IMCA_Code_of_Practice_for_Offshore_Diving" class="mw-redirect" title="IMCA Code of Practice for Offshore Diving">IMCA Code of Practice for Offshore Diving</a></li> <li><a href="/wiki/ISO_24801_Recreational_diving_services_%E2%80%94_Requirements_for_the_training_of_recreational_scuba_divers" class="mw-redirect" title="ISO 24801 Recreational diving services — Requirements for the training of recreational scuba divers">ISO 24801 Recreational diving services — Requirements for the training of recreational scuba divers</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">General non-fiction</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/The_Darkness_Beckons" title="The Darkness Beckons">The Darkness Beckons</a></i></li> <li><i><a href="/wiki/Goldfinder" title="Goldfinder">Goldfinder</a></i></li> <li><i><a href="/wiki/The_Last_Dive" title="The Last Dive">The Last Dive</a></i></li> <li><i><a href="/wiki/Shadow_Divers" title="Shadow Divers">Shadow Divers</a></i></li> <li><i><a href="/wiki/The_Silent_World:_A_Story_of_Undersea_Discovery_and_Adventure" title="The Silent World: A Story of Undersea Discovery and Adventure">The Silent World: A Story of Undersea Discovery and Adventure</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Research</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_Divers_Alert_Network_publications" title="List of Divers Alert Network publications">List of Divers Alert Network publications</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Dive_guide_(publication)" class="mw-redirect" title="Dive guide (publication)">Dive guides</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li class="mw-empty-elt"></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible uncollapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Training_and_registration" style="font-size:114%;margin:0 4em">Training and registration</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diver_training" title="Diver training">Diver<br />training</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Competence and assessment <ul><li><a href="/wiki/Competency-based_learning" title="Competency-based learning">Competency-based learning</a></li> <li><a href="/wiki/Refresher_training_(diving)" class="mw-redirect" title="Refresher training (diving)">Refresher training</a></li> <li><a href="/wiki/Skill_assessment" title="Skill assessment">Skill assessment</a></li></ul></li> <li><a href="/wiki/Diver_training_standard" title="Diver training standard">Diver training standard</a></li> <li><a href="/wiki/Diving_instructor" title="Diving instructor">Diving instructor</a></li> <li><a href="/wiki/Diving_school" class="mw-redirect" title="Diving school">Diving school</a></li> <li>Occupational diver training <ul><li><a href="/wiki/Commercial_diver_training" class="mw-redirect" title="Commercial diver training">Commercial diver training</a></li> <li><a href="/wiki/Military_diver_training" class="mw-redirect" title="Military diver training">Military diver training</a></li> <li><a href="/wiki/Public_safety_diver_training" class="mw-redirect" title="Public safety diver training">Public safety diver training</a></li> <li><a href="/wiki/Scientific_diver_training" class="mw-redirect" title="Scientific diver training">Scientific diver training</a></li></ul></li> <li><a href="/wiki/Recreational_diver_training" title="Recreational diver training">Recreational diver training</a> <ul><li><a href="/wiki/Introductory_diving" title="Introductory diving">Introductory diving</a></li> <li><a href="/wiki/ISO_recreational_diving_training_standards" class="mw-redirect" title="ISO recreational diving training standards">ISO training standards</a></li></ul></li> <li><a href="/wiki/Teaching_method" title="Teaching method">Teaching method</a> <ul><li><a href="/wiki/Muscle_memory" title="Muscle memory">Muscle memory</a></li> <li><a href="/wiki/Overlearning" title="Overlearning">Overlearning</a></li> <li><a href="/wiki/Stress_exposure_training" title="Stress exposure training">Stress exposure training</a></li></ul></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Skills" scope="row" class="navbox-group" style="width:1%">Skills</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Combat_sidestroke" title="Combat sidestroke">Combat sidestroke</a></li> <li><a href="/wiki/Diver_navigation" title="Diver navigation">Diver navigation</a></li> <li><a href="/wiki/Diver_trim" title="Diver trim">Diver trim</a></li> <li><a href="/wiki/Ear_clearing" title="Ear clearing">Ear clearing</a> <ul><li><a href="/wiki/Frenzel_maneuver" title="Frenzel maneuver">Frenzel maneuver</a></li> <li><a href="/wiki/Valsalva_maneuver" title="Valsalva maneuver">Valsalva maneuver</a></li></ul></li> <li><a href="/wiki/Finning_techniques" title="Finning techniques">Finning techniques</a></li> <li><a href="/wiki/Scuba_skills" title="Scuba skills">Scuba skills</a> <ul><li><a href="/wiki/Buddy_breathing" title="Buddy breathing">Buddy breathing</a></li> <li><a href="/wiki/Low_impact_diving" title="Low impact diving">Low impact diving</a> <ul><li><a href="/wiki/Diamond_Reef_System" title="Diamond Reef System">Diamond Reef System</a></li></ul></li></ul></li> <li><a href="/wiki/Surface-supplied_diving_skills" title="Surface-supplied diving skills">Surface-supplied diving skills</a></li> <li><a class="mw-selflink selflink">Underwater searches</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Recreational_scuba_certification_levels" title="Recreational scuba certification levels">Recreational<br />scuba<br />certification<br />levels</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Core diving skills</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Advanced_Open_Water_Diver" title="Advanced Open Water Diver">Advanced Open Water Diver</a></li> <li><a href="/wiki/Autonomous_diver" title="Autonomous diver">Autonomous diver</a></li> <li><a href="/wiki/CMAS*_scuba_diver" title="CMAS* scuba diver">CMAS* scuba diver</a></li> <li><a href="/wiki/CMAS**_scuba_diver" title="CMAS** scuba diver">CMAS** scuba diver</a></li> <li><a href="/wiki/Introductory_diving" title="Introductory diving">Introductory diving</a></li> <li><a href="/wiki/Low_Impact_Diver" class="mw-redirect" title="Low Impact Diver">Low Impact Diver</a></li> <li><a href="/wiki/Master_Scuba_Diver" title="Master Scuba Diver">Master Scuba Diver</a></li> <li><a href="/wiki/Open_Water_Diver" title="Open Water Diver">Open Water Diver</a></li> <li><a href="/wiki/Supervised_diver" title="Supervised diver">Supervised diver</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Leadership skills</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Dive_leader" title="Dive leader">Dive leader</a> <ul><li><a href="/wiki/Divemaster" title="Divemaster">Divemaster</a></li></ul></li> <li><a href="/wiki/Diving_instructor" title="Diving instructor">Diving instructor</a> <ul><li><a href="/wiki/Master_Instructor" class="mw-redirect" title="Master Instructor">Master Instructor</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Specialist skills</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Rescue_Diver" title="Rescue Diver">Rescue Diver</a></li> <li><a href="/wiki/Solo_diver" class="mw-redirect" title="Solo diver">Solo diver</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diver_training_organization" title="Diver training organization">Diver training<br />certification<br />and registration<br />organisations</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/European_Underwater_Federation" title="European Underwater Federation">European Underwater Federation</a> (EUF)</li> <li><a href="/wiki/International_Diving_Regulators_and_Certifiers_Forum" title="International Diving Regulators and Certifiers Forum">International Diving Regulators and Certifiers Forum</a> (IDRCF)</li> <li><a href="/wiki/International_Diving_Schools_Association" title="International Diving Schools Association">International Diving Schools Association</a> (IDSA)</li> <li><a href="/wiki/International_Marine_Contractors_Association" title="International Marine Contractors Association">International Marine Contractors Association</a> (IMCA)</li> <li><a href="/wiki/List_of_diver_certification_organizations" title="List of diver certification organizations">List of diver certification organizations</a></li> <li><a href="/wiki/National_Oceanic_and_Atmospheric_Administration" title="National Oceanic and Atmospheric Administration">National Oceanic and Atmospheric Administration</a> (NOAA)</li> <li><a href="/wiki/Nautical_Archaeology_Society" title="Nautical Archaeology Society">Nautical Archaeology Society</a></li> <li><a href="/wiki/Recreational_diver_course_referral" title="Recreational diver course referral">Recreational diver course referral</a></li> <li><a href="/wiki/World_Recreational_Scuba_Training_Council" title="World Recreational Scuba Training Council">World Recreational Scuba Training Council</a> (WRSTC)</li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Commercial diver<br />certification<br />authorities</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Australian_Diver_Accreditation_Scheme" title="Australian Diver Accreditation Scheme">Australian Diver Accreditation Scheme</a> (ADAS)</li> <li><a href="/wiki/Commercial_diver_registration_in_South_Africa" title="Commercial diver registration in South Africa">Commercial diver registration in South Africa</a></li> <li><a href="/wiki/Divers_Institute_of_Technology" title="Divers Institute of Technology">Divers Institute of Technology</a></li> <li><a href="/wiki/Health_and_Safety_Executive" title="Health and Safety Executive">Health and Safety Executive</a> (HSE)</li> <li><a href="/wiki/Department_of_Employment_and_Labour" title="Department of Employment and Labour">Department of Employment and Labour</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Commercial diving<br />schools</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Divers_Academy_International" title="Divers Academy International">Divers Academy International</a></li> <li><a href="/wiki/Western_Norway_University_of_Applied_Sciences#Norwegian_diver_school" title="Western Norway University of Applied Sciences">Norwegian diver school</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Free-diving<br />certification<br />agencies</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/AIDA_International" title="AIDA International">AIDA International</a> (AIDA)</li> <li><a href="/wiki/Conf%C3%A9d%C3%A9ration_Mondiale_des_Activit%C3%A9s_Subaquatiques" title="Confédération Mondiale des Activités Subaquatiques">Confédération Mondiale des Activités Subaquatiques</a> (CMAS)</li> <li><a href="/wiki/Performance_Freediving_International" title="Performance Freediving International">Performance Freediving International</a> (PI)</li> <li><a href="/wiki/Scuba_Schools_International" title="Scuba Schools International">Scuba Schools International</a> (SSI)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Recreational<br />scuba<br />certification<br />agencies</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/American_Canadian_Underwater_Certifications" title="American Canadian Underwater Certifications">American Canadian Underwater Certifications</a> (ACUC)</li> <li><a href="/wiki/American_Nitrox_Divers_International" title="American Nitrox Divers International">American Nitrox Divers International</a> (ANDI)</li> <li><a href="/wiki/Association_nationale_des_moniteurs_de_plong%C3%A9e" title="Association nationale des moniteurs de plongée">Association nationale des moniteurs de plongée</a> (ANMP)</li> <li><a href="/wiki/British_Sub-Aqua_Club" title="British Sub-Aqua Club">British Sub-Aqua Club</a> (BSAC)</li> <li><a href="/wiki/Comhairle_Fo-Thuinn" title="Comhairle Fo-Thuinn">Comhairle Fo-Thuinn</a> (CFT)</li> <li><a href="/wiki/Conf%C3%A9d%C3%A9ration_Mondiale_des_Activit%C3%A9s_Subaquatiques" title="Confédération Mondiale des Activités Subaquatiques">Confédération Mondiale des Activités Subaquatiques</a> (CMAS)</li> <li><a href="/wiki/Federaci%C3%B3n_Espa%C3%B1ola_de_Actividades_Subacu%C3%A1ticas" title="Federación Española de Actividades Subacuáticas">Federación Española de Actividades Subacuáticas</a> (FEDAS)</li> <li><a href="/wiki/F%C3%A9d%C3%A9ration_Fran%C3%A7aise_d%27%C3%89tudes_et_de_Sports_Sous-Marins" title="Fédération Française d'Études et de Sports Sous-Marins">Fédération Française d'Études et de Sports Sous-Marins</a> (FFESSM)</li> <li><a href="/wiki/Federazione_Italiana_Attivit%C3%A0_Subacquee" title="Federazione Italiana Attività Subacquee">Federazione Italiana Attività Subacquee</a> (FIAS)</li> <li><a href="/wiki/Global_Underwater_Explorers" title="Global Underwater Explorers">Global Underwater Explorers</a> (GUE)</li> <li><a href="/wiki/International_Association_for_Handicapped_Divers" title="International Association for Handicapped Divers">International Association for Handicapped Divers</a> (IAHD)</li> <li><a href="/wiki/International_Association_of_Nitrox_and_Technical_Divers" title="International Association of Nitrox and Technical Divers">International Association of Nitrox and Technical Divers</a> (IANTD)</li> <li><a href="/wiki/International_Life_Saving_Federation" title="International Life Saving Federation">International Life Saving Federation</a> (ILS)</li> <li><a href="/wiki/Israeli_Diving_Federation" title="Israeli Diving Federation">Israeli Diving Federation</a> (TIDF)</li> <li><a href="/wiki/National_Academy_of_Scuba_Educators" title="National Academy of Scuba Educators">National Academy of Scuba Educators</a> (NASE)</li> <li><a href="/wiki/National_Association_of_Underwater_Instructors" title="National Association of Underwater Instructors">National Association of Underwater Instructors</a> (NAUI)</li> <li><a href="/wiki/Nederlandse_Onderwatersport_Bond" title="Nederlandse Onderwatersport Bond">Nederlandse Onderwatersport Bond</a> (NOB)</li> <li><a href="/wiki/Professional_Association_of_Diving_Instructors" title="Professional Association of Diving Instructors">Professional Association of Diving Instructors</a> (PADI)</li> <li><a href="/wiki/Professional_Diving_Instructors_Corporation" title="Professional Diving Instructors Corporation">Professional Diving Instructors Corporation</a> (PDIC)</li> <li><a href="/wiki/Professional_Technical_and_Recreational_Diving" title="Professional Technical and Recreational Diving">Professional Technical and Recreational Diving</a> (ProTec)</li> <li><a href="/wiki/Rebreather_Association_of_International_Divers" title="Rebreather Association of International Divers">Rebreather Association of International Divers</a> (RAID)</li> <li><a href="/wiki/Sub-Aqua_Association" title="Sub-Aqua Association">Sub-Aqua Association</a> (SAA)</li> <li><a href="/wiki/Scuba_Diving_International" title="Scuba Diving International">Scuba Diving International</a> (SDI)</li> <li><a href="/wiki/Scuba_Educators_International" title="Scuba Educators International">Scuba Educators International</a> (SEI)</li> <li><a href="/wiki/Scottish_Sub_Aqua_Club" title="Scottish Sub Aqua Club">Scottish Sub Aqua Club</a> (ScotSAC)</li> <li><a href="/wiki/Scuba_Schools_International" title="Scuba Schools International">Scuba Schools International</a> (SSI)</li> <li><a href="/wiki/Turkish_Underwater_Sports_Federation" title="Turkish Underwater Sports Federation">Türkiye Sualtı Sporları Federasyonu</a> (TSSF)</li> <li><a href="/wiki/United_Diving_Instructors" title="United Diving Instructors">United Diving Instructors</a> (UDI)</li> <li><a href="/wiki/YMCA_SCUBA_Program" title="YMCA SCUBA Program">YMCA SCUBA Program</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Scientific diver<br />certification<br />authorities</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/American_Academy_of_Underwater_Sciences" title="American Academy of Underwater Sciences">American Academy of Underwater Sciences</a> (AAUS)</li> <li><a href="/wiki/Conf%C3%A9d%C3%A9ration_Mondiale_des_Activit%C3%A9s_Subaquatiques#Scientific_committee" title="Confédération Mondiale des Activités Subaquatiques">CMAS Scientific Committee</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Technical diver<br />certification<br />agencies</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/American_Nitrox_Divers_International" title="American Nitrox Divers International">American Nitrox Divers International</a> (ANDI)</li> <li><a href="/wiki/British_Sub-Aqua_Club" title="British Sub-Aqua Club">British Sub-Aqua Club</a> (BSAC)</li> <li><a href="/wiki/Conf%C3%A9d%C3%A9ration_Mondiale_des_Activit%C3%A9s_Subaquatiques" title="Confédération Mondiale des Activités Subaquatiques">Confédération Mondiale des Activités Subaquatiques</a> (CMAS)</li> <li><a href="/wiki/Diving_Science_and_Technology" title="Diving Science and Technology">Diving Science and Technology</a> (DSAT)</li> <li><a href="/wiki/Federazione_Italiana_Attivit%C3%A0_Subacquee" title="Federazione Italiana Attività Subacquee">Federazione Italiana Attività Subacquee</a> (FIAS)</li> <li><a href="/wiki/International_Association_of_Nitrox_and_Technical_Divers" title="International Association of Nitrox and Technical Divers">International Association of Nitrox and Technical Divers</a> (IANTD)</li> <li><a href="/wiki/Professional_Association_of_Diving_Instructors" title="Professional Association of Diving Instructors">Professional Association of Diving Instructors</a> (PADI)</li> <li><a href="/wiki/Professional_Diving_Instructors_Corporation" title="Professional Diving Instructors Corporation">Professional Diving Instructors Corporation</a> (PDIC)</li> <li><a href="/wiki/Professional_Technical_and_Recreational_Diving" title="Professional Technical and Recreational Diving">Professional Technical and Recreational Diving</a> (ProTec)</li> <li><a href="/wiki/Rebreather_Association_of_International_Divers" title="Rebreather Association of International Divers">Rebreather Association of International Divers</a> (RAID)</li> <li><a href="/wiki/Trimix_Scuba_Association" title="Trimix Scuba Association">Trimix Scuba Association</a> (TSA)</li> <li><a href="/wiki/Scuba_Schools_International" title="Scuba Schools International">Technical Extended Range</a> (TXR)</li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Cavediving" scope="row" class="navbox-group" style="width:1%">Cave<br />diving</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cave_Divers_Association_of_Australia" title="Cave Divers Association of Australia">Cave Divers Association of Australia</a> (CDAA)</li> <li><a href="/wiki/Cave_Diving_Group" title="Cave Diving Group">Cave Diving Group</a> (CDG)</li> <li><a href="/wiki/Global_Underwater_Explorers" title="Global Underwater Explorers">Global Underwater Explorers</a> (GUE)</li> <li><a href="/wiki/National_Speleological_Society#Cave_Diving_Group" title="National Speleological Society">National Speleological Society#Cave Diving Group</a> (CDG)</li> <li><a href="/wiki/National_Association_of_Underwater_Instructors" title="National Association of Underwater Instructors">National Association of Underwater Instructors</a> (NAUI)</li> <li><a href="/wiki/Technical_Diving_International" title="Technical Diving International">Technical Diving International</a> (TDI)</li></ul> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Military diver<br />training centres</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Defence_Diving_School" title="Defence Diving School">Defence Diving School</a></li> <li><a href="/wiki/Naval_Support_Activity_Panama_City#Tenant_commands" title="Naval Support Activity Panama City">Navy Diving Salvage and Training Center</a></li> <li><a href="/wiki/Underwater_Escape_Training_Unit" title="Underwater Escape Training Unit">Underwater Escape Training Unit</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Military diver<br />training courses</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/United_States_Marine_Corps_Combatant_Diver_Course" title="United States Marine Corps Combatant Diver Course">United States Marine Corps Combatant Diver Course</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Underwater_sports" style="font-size:114%;margin:0 4em"><a href="/wiki/Underwater_sports" title="Underwater sports">Underwater sports</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Surface snorkeling</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Finswimming" title="Finswimming">Finswimming</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Snorkeling/breath-hold</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Spearfishing" title="Spearfishing">Spearfishing</a></li> <li><a href="/wiki/Underwater_football" title="Underwater football">Underwater football</a></li> <li><a href="/wiki/Underwater_hockey" title="Underwater hockey">Underwater hockey</a> <ul><li><a href="/wiki/Underwater_hockey_in_Australia" title="Underwater hockey in Australia">Australia</a></li> <li><a href="/wiki/Underwater_hockey_in_Turkey" title="Underwater hockey in Turkey">Turkey</a></li></ul></li> <li><a href="/wiki/Underwater_rugby" title="Underwater rugby">Underwater rugby</a> <ul><li><a href="/wiki/Underwater_rugby_in_Colombia" class="mw-redirect" title="Underwater rugby in Colombia">Colombia</a></li> <li><a href="/wiki/Underwater_rugby_in_the_United_States" title="Underwater rugby in the United States">United States</a></li></ul></li> <li><a href="/wiki/Underwater_target_shooting" title="Underwater target shooting">Underwater target shooting</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Breath-hold</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aquathlon_(underwater_wrestling)" title="Aquathlon (underwater wrestling)">Aquathlon</a></li> <li><a href="/wiki/Apnoea_finswimming" class="mw-redirect" title="Apnoea finswimming">Apnoea finswimming</a></li> <li><a href="/wiki/Freediving" title="Freediving">Freediving</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Open Circuit Scuba</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Immersion_finswimming" class="mw-redirect" title="Immersion finswimming">Immersion finswimming</a></li> <li><a href="/wiki/Sport_diving_(sport)" title="Sport diving (sport)">Sport diving</a></li> <li><a href="/wiki/Underwater_cycling" title="Underwater cycling">Underwater cycling</a></li> <li><a href="/wiki/Underwater_orienteering" title="Underwater orienteering">Underwater orienteering</a></li> <li><a href="/wiki/Underwater_photography_(sport)" title="Underwater photography (sport)">Underwater photography</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Rebreather</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Underwater_photography_(sport)" title="Underwater photography (sport)">Underwater photography</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Sports governing<br />organisations<br /> and federations</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>International <ul><li><a href="/wiki/AIDA_International" title="AIDA International">AIDA International</a></li> <li><a href="/wiki/Conf%C3%A9d%C3%A9ration_Mondiale_des_Activit%C3%A9s_Subaquatiques" title="Confédération Mondiale des Activités Subaquatiques">Confédération Mondiale des Activités Subaquatiques</a>)</li></ul></li> <li>National <ul><li><a href="/wiki/AIDA_Hellas" title="AIDA Hellas">AIDA Hellas</a></li> <li><a href="/wiki/Australian_Underwater_Federation" title="Australian Underwater Federation">Australian Underwater Federation</a></li> <li><a href="/wiki/British_Freediving_Association" title="British Freediving Association">British Freediving Association</a></li> <li><a href="/wiki/British_Octopush_Association" title="British Octopush Association">British Octopush Association</a></li> <li><a href="/wiki/British_Underwater_Sports_Association" title="British Underwater Sports Association">British Underwater Sports Association</a></li> <li><a href="/wiki/Comhairle_Fo-Thuinn" title="Comhairle Fo-Thuinn">Comhairle Fo-Thuinn</a></li> <li><a href="/wiki/Federaci%C3%B3n_Espa%C3%B1ola_de_Actividades_Subacu%C3%A1ticas" title="Federación Española de Actividades Subacuáticas">Federación Española de Actividades Subacuáticas</a></li> <li><a href="/wiki/French_federation_of_underwater_studies_and_sports" class="mw-redirect" title="French federation of underwater studies and sports">Fédération Française d'Études et de Sports Sous-Marins</a></li> <li><a href="/wiki/South_African_Underwater_Sports_Federation" title="South African Underwater Sports Federation">South African Underwater Sports Federation</a></li> <li><a href="/wiki/Turkish_Underwater_Sports_Federation" title="Turkish Underwater Sports Federation">Türkiye Sualtı Sporları Federasyonu</a></li> <li><a href="/wiki/Underwater_Society_of_America" title="Underwater Society of America">Underwater Society of America</a>)</li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Competitions</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/14th_CMAS_Underwater_Photography_World_Championship" title="14th CMAS Underwater Photography World Championship">14th CMAS Underwater Photography World Championship</a></li> <li><a href="/wiki/Underwater_Hockey_World_Championships" title="Underwater Hockey World Championships">Underwater Hockey World Championships</a></li> <li><a href="/wiki/Underwater_Orienteering_World_Championships" title="Underwater Orienteering World Championships">Underwater Orienteering World Championships</a></li> <li><a href="/wiki/Underwater_Rugby_World_Championships" title="Underwater Rugby World Championships">Underwater Rugby World Championships</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Underwater_divers" style="font-size:114%;margin:0 4em"><a href="/wiki/Outline_of_underwater_divers" title="Outline of underwater divers">Underwater divers</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Pioneers<br />of diving</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Eduard_Admetlla_i_L%C3%A1zaro" title="Eduard Admetlla i Lázaro">Eduard Admetlla i Lázaro</a></li> <li><a href="/wiki/Aquanaut" title="Aquanaut">Aquanaut</a></li> <li><a href="/wiki/Mary_Bonnin" title="Mary Bonnin">Mary Bonnin</a></li> <li><a href="/wiki/Amelia_Behrens-Furniss" title="Amelia Behrens-Furniss">Amelia Behrens-Furniss</a></li> <li><a href="/wiki/James_F._Cahill" title="James F. Cahill">James F. Cahill</a></li> <li><a href="/wiki/Jacques_Cousteau" title="Jacques Cousteau">Jacques Cousteau</a></li> <li><a href="/wiki/Billy_Deans_(diver)" title="Billy Deans (diver)">Billy Deans</a></li> <li><a href="/wiki/Dottie_Frazier" title="Dottie Frazier">Dottie Frazier</a></li> <li><a href="/wiki/Trevor_Hampton" title="Trevor Hampton">Trevor Hampton</a></li> <li><a href="/wiki/Hans_Hass" title="Hans Hass">Hans Hass</a></li> <li><a href="/wiki/Dick_Rutkowski" title="Dick Rutkowski">Dick Rutkowski</a></li> <li><a href="/wiki/Teseo_Tesei" title="Teseo Tesei">Teseo Tesei</a></li> <li><a href="/wiki/Arne_Zetterstr%C3%B6m" title="Arne Zetterström">Arne Zetterström</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Underwater<br />scientists<br />archaeologists and<br />environmentalists</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Michael_Arbuthnot" title="Michael Arbuthnot">Michael Arbuthnot</a></li> <li><a href="/wiki/Robert_Ballard" title="Robert Ballard">Robert Ballard</a></li> <li><a href="/wiki/George_Bass_(archaeologist)" title="George Bass (archaeologist)">George Bass</a></li> <li><a href="/wiki/Mensun_Bound" title="Mensun Bound">Mensun Bound</a></li> <li><a href="/wiki/Louis_Boutan" title="Louis Boutan">Louis Boutan</a></li> <li><a href="/wiki/Jeffrey_Bozanic" title="Jeffrey Bozanic">Jeffrey Bozanic</a></li> <li><a href="/wiki/Hugh_Bradner" title="Hugh Bradner">Hugh Bradner</a></li> <li><a href="/wiki/Cathy_Church" title="Cathy Church">Cathy Church</a></li> <li><a href="/wiki/Eugenie_Clark" title="Eugenie Clark">Eugenie Clark</a></li> <li><a href="/wiki/James_P._Delgado" title="James P. Delgado">James P. Delgado</a></li> <li><a href="/wiki/Sylvia_Earle" title="Sylvia Earle">Sylvia Earle</a></li> <li><a href="/wiki/John_Christopher_Fine" title="John Christopher Fine">John Christopher Fine</a></li> <li><a href="/wiki/George_R._Fischer" title="George R. Fischer">George R. Fischer</a></li> <li><a href="/wiki/Anders_Franz%C3%A9n" title="Anders Franzén">Anders Franzén</a></li> <li><a href="/wiki/Honor_Frost" title="Honor Frost">Honor Frost</a></li> <li><a href="/wiki/Fernando_Garfella_Palmer" title="Fernando Garfella Palmer">Fernando Garfella Palmer</a></li> <li><a href="/wiki/David_Gibbins" title="David Gibbins">David Gibbins</a></li> <li><a href="/wiki/Graham_Jessop" title="Graham Jessop">Graham Jessop</a></li> <li><a href="/wiki/Swietenia_Puspa_Lestari" title="Swietenia Puspa Lestari">Swietenia Puspa Lestari</a></li> <li><a href="/wiki/Pilar_Luna" title="Pilar Luna">Pilar Luna</a></li> <li><a href="/wiki/Robert_F._Marx" title="Robert F. Marx">Robert F. Marx</a></li> <li><a href="/wiki/Anna_Marguerite_McCann" title="Anna Marguerite McCann">Anna Marguerite McCann</a></li> <li><a href="/wiki/Innes_McCartney" title="Innes McCartney">Innes McCartney</a></li> <li><a href="/wiki/Charles_T._Meide" title="Charles T. Meide">Charles T. Meide</a></li> <li><a href="/wiki/Mark_M._Newell" title="Mark M. Newell">Mark M. Newell</a></li> <li><a href="/wiki/Lyuba_Ognenova-Marinova" title="Lyuba Ognenova-Marinova">Lyuba Ognenova-Marinova</a></li> <li><a href="/wiki/John_Peter_Oleson" title="John Peter Oleson">John Peter Oleson</a></li> <li><a href="/wiki/Mendel_L._Peterson" title="Mendel L. Peterson">Mendel L. Peterson</a></li> <li><a href="/wiki/Richard_Pyle" title="Richard Pyle">Richard Pyle</a></li> <li><a href="/wiki/Andreas_Rechnitzer" title="Andreas Rechnitzer">Andreas Rechnitzer</a></li> <li><a href="/wiki/William_R._Royal" title="William R. Royal">William R. Royal</a></li> <li><a href="/wiki/Margaret_Rule" title="Margaret Rule">Margaret Rule</a></li> <li><a href="/wiki/Gunter_Sch%C3%B6bel" title="Gunter Schöbel">Gunter Schöbel</a></li> <li><a href="/wiki/Stephanie_Schwabe" title="Stephanie Schwabe">Stephanie Schwabe</a></li> <li><a href="/wiki/Myriam_Seco" title="Myriam Seco">Myriam Seco</a></li> <li><a href="/wiki/E._Lee_Spence" title="E. Lee Spence">E. Lee Spence</a></li> <li><a href="/wiki/Robert_St%C3%A9nuit" title="Robert Sténuit">Robert Sténuit</a></li> <li><a href="/wiki/Peter_Throckmorton" title="Peter Throckmorton">Peter Throckmorton</a></li> <li><a href="/wiki/Cristina_Zenato" title="Cristina Zenato">Cristina Zenato</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Scuba record<br />holders</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Pascal_Bernab%C3%A9" title="Pascal Bernabé">Pascal Bernabé</a></li> <li><a href="/wiki/Jim_Bowden_(diver)" title="Jim Bowden (diver)">Jim Bowden</a></li> <li><a href="/wiki/Mark_Ellyatt" title="Mark Ellyatt">Mark Ellyatt</a></li> <li><a href="/wiki/Sheck_Exley" title="Sheck Exley">Sheck Exley</a></li> <li><a href="/wiki/Nuno_Gomes_(diver)" title="Nuno Gomes (diver)">Nuno Gomes</a></li> <li><a href="/wiki/Claudia_Serpieri" title="Claudia Serpieri">Claudia Serpieri</a></li> <li><a href="/wiki/Krzysztof_Starnawski" title="Krzysztof Starnawski">Krzysztof Starnawski</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Underwater<br />filmmakers<br />and presenters</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Samir_Alhafith" title="Samir Alhafith">Samir Alhafith</a></li> <li><a href="/wiki/David_Attenborough" title="David Attenborough">David Attenborough</a></li> <li><a href="/wiki/Ram%C3%B3n_Bravo" title="Ramón Bravo">Ramón Bravo</a></li> <li><a href="/wiki/Jean-Michel_Cousteau" title="Jean-Michel Cousteau">Jean-Michel Cousteau</a></li> <li><a href="/wiki/Richie_Kohler" title="Richie Kohler">Richie Kohler</a></li> <li><a href="/wiki/Paul_Rose_(TV_presenter)" title="Paul Rose (TV presenter)">Paul Rose</a></li> <li><a href="/wiki/Andy_Torbet" title="Andy Torbet">Andy Torbet</a></li> <li><a href="/wiki/Ivan_Tors" title="Ivan Tors">Ivan Tors</a></li> <li><a href="/wiki/Andrew_Wight" title="Andrew Wight">Andrew Wight</a></li> <li><a href="/wiki/James_Cameron" title="James Cameron">James Cameron</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Underwater<br />photographers</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Doug_Allan" title="Doug Allan">Doug Allan</a></li> <li><a href="/wiki/Tamara_Benitez" title="Tamara Benitez">Tamara Benitez</a></li> <li><a href="/wiki/Georges_Beuchat" title="Georges Beuchat">Georges Beuchat</a></li> <li><a href="/wiki/Adrian_Biddle" title="Adrian Biddle">Adrian Biddle</a></li> <li><a href="/wiki/Jonathan_Bird" title="Jonathan Bird">Jonathan Bird</a></li> <li><a href="/wiki/Eric_Cheng" title="Eric Cheng">Eric Cheng</a></li> <li><a href="/wiki/Neville_Coleman" title="Neville Coleman">Neville Coleman</a></li> <li><a href="/wiki/Jacques_Cousteau" title="Jacques Cousteau">Jacques Cousteau</a></li> <li><a href="/wiki/John_D._Craig" title="John D. Craig">John D. Craig</a></li> <li><a href="/wiki/Ben_Cropp" title="Ben Cropp">Ben Cropp</a></li> <li><a href="/wiki/Bernard_Delemotte" title="Bernard Delemotte">Bernard Delemotte</a></li> <li><a href="/wiki/David_Doubilet" title="David Doubilet">David Doubilet</a></li> <li><a href="/wiki/Candice_Farmer" title="Candice Farmer">Candice Farmer</a></li> <li><a href="/wiki/John_Christopher_Fine" title="John Christopher Fine">John Christopher Fine</a></li> <li><a href="/wiki/Rodney_Fox" title="Rodney Fox">Rodney Fox</a></li> <li><a href="/wiki/Ric_Frazier" title="Ric Frazier">Ric Frazier</a></li> <li><a href="/wiki/Stephen_Frink" title="Stephen Frink">Stephen Frink</a></li> <li><a href="/wiki/Peter_Gimbel" title="Peter Gimbel">Peter Gimbel</a></li> <li><a href="/wiki/Monty_Halls" title="Monty Halls">Monty Halls</a></li> <li><a href="/wiki/Hans_Hass" title="Hans Hass">Hans Hass</a></li> <li><a href="/wiki/Henry_Way_Kendall" title="Henry Way Kendall">Henry Way Kendall</a></li> <li><a href="/wiki/Rudie_Kuiter" class="mw-redirect" title="Rudie Kuiter">Rudie Kuiter</a></li> <li><a href="/wiki/Joseph_B._MacInnis" title="Joseph B. MacInnis">Joseph B. MacInnis</a></li> <li><a href="/wiki/Luis_Marden" title="Luis Marden">Luis Marden</a></li> <li><a href="/wiki/Agnes_Milowka" title="Agnes Milowka">Agnes Milowka</a></li> <li><a href="/wiki/Noel_Monkman" title="Noel Monkman">Noel Monkman</a></li> <li><a href="/wiki/Pete_Oxford" title="Pete Oxford">Pete Oxford</a></li> <li><a href="/wiki/Steve_Parish" title="Steve Parish">Steve Parish</a></li> <li><a href="/wiki/Zale_Parry" title="Zale Parry">Zale Parry</a></li> <li><a href="/wiki/Pierre_Petit_(photographer)" title="Pierre Petit (photographer)">Pierre Petit</a></li> <li><a href="/wiki/Leni_Riefenstahl" title="Leni Riefenstahl">Leni Riefenstahl</a></li> <li><a href="/wiki/Peter_Scoones" title="Peter Scoones">Peter Scoones</a></li> <li><a href="/wiki/Brian_Skerry" title="Brian Skerry">Brian Skerry</a></li> <li><a href="/wiki/Wesley_C._Skiles" title="Wesley C. Skiles">Wesley C. Skiles</a></li> <li><a href="/wiki/E._Lee_Spence" title="E. Lee Spence">E. Lee Spence</a></li> <li><a href="/wiki/Philippe_Tailliez" title="Philippe Tailliez">Philippe Tailliez</a></li> <li><a href="/wiki/Ron_Taylor_(diver)" title="Ron Taylor (diver)">Ron Taylor</a></li> <li><a href="/wiki/Valerie_Taylor_(diver)" title="Valerie Taylor (diver)">Valerie Taylor</a></li> <li><a href="/wiki/Albert_Tillman" title="Albert Tillman">Albert Tillman</a></li> <li><a href="/wiki/John_Veltri" title="John Veltri">John Veltri</a></li> <li><a href="/wiki/Stan_Waterman" title="Stan Waterman">Stan Waterman</a></li> <li><a href="/wiki/Michele_Westmorland" title="Michele Westmorland">Michele Westmorland</a></li> <li><a href="/wiki/John_Ernest_Williamson" title="John Ernest Williamson">John Ernest Williamson</a></li> <li><a href="/wiki/J._Lamar_Worzel" title="J. Lamar Worzel">J. Lamar Worzel</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Underwater<br />explorers</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Caves <ul><li><a href="/wiki/Graham_Balcombe" title="Graham Balcombe">Graham Balcombe</a></li> <li><a href="/wiki/Sheck_Exley" title="Sheck Exley">Sheck Exley</a></li> <li><a href="/wiki/Martyn_Farr" title="Martyn Farr">Martyn Farr</a></li> <li><a href="/wiki/Jochen_Hasenmayer" title="Jochen Hasenmayer">Jochen Hasenmayer</a></li> <li><a href="/wiki/Jill_Heinerth" title="Jill Heinerth">Jill Heinerth</a></li> <li><a href="/wiki/Jarrod_Jablonski" title="Jarrod Jablonski">Jarrod Jablonski</a></li> <li><a href="/wiki/William_Hogarth_Main" title="William Hogarth Main">William Hogarth Main</a></li> <li><a href="/wiki/Tom_Mount" title="Tom Mount">Tom Mount</a></li> <li><a href="/wiki/Jack_Sheppard_(cave_diver)" title="Jack Sheppard (cave diver)">Jack Sheppard</a></li> <li><a href="/wiki/William_Stone_(caver)" title="William Stone (caver)">Bill Stone</a></li></ul></li> <li>Reefs <ul><li><a href="/wiki/Arthur_C._Clarke" title="Arthur C. Clarke">Arthur C. Clarke</a></li></ul></li> <li>Wrecks <ul><li><a href="/wiki/Leigh_Bishop" title="Leigh Bishop">Leigh Bishop</a></li> <li><a href="/wiki/John_Chatterton" title="John Chatterton">John Chatterton</a></li> <li><a href="/wiki/Clive_Cussler" title="Clive Cussler">Clive Cussler</a></li> <li><a href="/wiki/Bill_Nagle" title="Bill Nagle">Bill Nagle</a></li> <li><a href="/wiki/Valerie_van_Heest" title="Valerie van Heest">Valerie van Heest</a></li> <li><a href="/wiki/Aristotelis_Zervoudis" title="Aristotelis Zervoudis">Aristotelis Zervoudis</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Aquanaut" title="Aquanaut">Aquanauts</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Andrew_Abercromby" title="Andrew Abercromby">Andrew Abercromby</a></li> <li><a href="/wiki/Joseph_M._Acaba" title="Joseph M. Acaba">Joseph M. Acaba</a></li> <li><a href="/wiki/Clayton_Anderson" title="Clayton Anderson">Clayton Anderson</a></li> <li><a href="/wiki/Richard_R._Arnold" title="Richard R. Arnold">Richard R. Arnold</a></li> <li><a href="/wiki/Serena_Au%C3%B1%C3%B3n-Chancellor" title="Serena Auñón-Chancellor">Serena Auñón-Chancellor</a></li> <li><a href="/wiki/Michael_Barratt_(astronaut)" title="Michael Barratt (astronaut)">Michael Barratt (astronaut)</a></li> <li><a href="/wiki/Robert_A._Barth" title="Robert A. Barth">Robert A. Barth</a></li> <li><a href="/wiki/Bob_Behnken" title="Bob Behnken">Robert L. Behnken</a></li> <li><a href="/wiki/Randolph_Bresnik" title="Randolph Bresnik">Randolph Bresnik</a></li> <li><a href="/wiki/Timothy_J._Broderick" title="Timothy J. Broderick">Timothy J. Broderick</a></li> <li><a href="/wiki/Justin_Brown_(aquanaut)" title="Justin Brown (aquanaut)">Justin Brown</a></li> <li><a href="/wiki/Berry_L._Cannon" title="Berry L. Cannon">Berry L. Cannon</a></li> <li><a href="/wiki/Scott_Carpenter" title="Scott Carpenter">Scott Carpenter</a></li> <li><a href="/wiki/Gregory_Chamitoff" title="Gregory Chamitoff">Gregory Chamitoff</a></li> <li><a href="/wiki/Steve_Chappell" title="Steve Chappell">Steve Chappell</a></li> <li><a href="/wiki/Catherine_Coleman" title="Catherine Coleman">Catherine Coleman</a></li> <li><a href="/wiki/Robin_Cook_(American_novelist)" title="Robin Cook (American novelist)">Robin Cook</a></li> <li><a href="/wiki/Craig_B._Cooper" title="Craig B. Cooper">Craig B. Cooper</a></li> <li><a href="/wiki/Fabien_Cousteau" title="Fabien Cousteau">Fabien Cousteau</a></li> <li><a href="/wiki/Philippe_Cousteau" title="Philippe Cousteau">Philippe Cousteau</a></li> <li><a href="/wiki/Timothy_Creamer" title="Timothy Creamer">Timothy Creamer</a></li> <li><a href="/wiki/Jonathan_Dory" title="Jonathan Dory">Jonathan Dory</a></li> <li><a href="/wiki/Pedro_Duque" title="Pedro Duque">Pedro Duque</a></li> <li><a href="/wiki/Sylvia_Earle" title="Sylvia Earle">Sylvia Earle</a></li> <li><a href="/wiki/Jeanette_Epps" title="Jeanette Epps">Jeanette Epps</a></li> <li><a href="/wiki/Sheck_Exley" title="Sheck Exley">Sheck Exley</a></li> <li><a href="/wiki/Albert_Falco" title="Albert Falco">Albert Falco</a></li> <li><a href="/wiki/Andrew_J._Feustel" title="Andrew J. Feustel">Andrew J. Feustel</a></li> <li><a href="/wiki/Michael_Fincke" title="Michael Fincke">Michael Fincke</a></li> <li><a href="/wiki/Satoshi_Furukawa" title="Satoshi Furukawa">Satoshi Furukawa</a></li> <li><a href="/wiki/Ronald_J._Garan_Jr." title="Ronald J. Garan Jr.">Ronald J. Garan Jr.</a></li> <li><a href="/wiki/Michael_L._Gernhardt" title="Michael L. Gernhardt">Michael L. Gernhardt</a></li> <li><a href="/wiki/Christopher_E._Gerty" title="Christopher E. Gerty">Christopher E. Gerty</a></li> <li><a href="/wiki/David_Gruber" title="David Gruber">David Gruber</a></li> <li><a href="/wiki/Chris_Hadfield" title="Chris Hadfield">Chris Hadfield</a></li> <li><a href="/wiki/Jeremy_Hansen" title="Jeremy Hansen">Jeremy Hansen</a></li> <li><a href="/wiki/Jos%C3%A9_M._Hern%C3%A1ndez" title="José M. Hernández">José M. Hernández</a></li> <li><a href="/wiki/John_Herrington" title="John Herrington">John Herrington</a></li> <li><a href="/wiki/Paul_Hill_(flight_director)" title="Paul Hill (flight director)">Paul Hill</a></li> <li><a href="/wiki/Akihiko_Hoshide" title="Akihiko Hoshide">Akihiko Hoshide</a></li> <li><a href="/wiki/Mark_Hulsbeck" title="Mark Hulsbeck">Mark Hulsbeck</a></li> <li><a href="/wiki/Emma_Hwang" title="Emma Hwang">Emma Hwang</a></li> <li><a href="/wiki/Norishige_Kanai" title="Norishige Kanai">Norishige Kanai</a></li> <li><a href="/wiki/Les_Kaufman" title="Les Kaufman">Les Kaufman</a></li> <li><a href="/wiki/Scott_Kelly_(astronaut)" title="Scott Kelly (astronaut)">Scott Kelly</a></li> <li><a href="/wiki/Karen_Kohanowich" title="Karen Kohanowich">Karen Kohanowich</a></li> <li><a href="/wiki/Timothy_Kopra" title="Timothy Kopra">Timothy Kopra</a></li> <li><a href="/wiki/Dominic_Landucci" title="Dominic Landucci">Dominic Landucci</a></li> <li><a href="/wiki/Jon_Lindbergh" title="Jon Lindbergh">Jon Lindbergh</a></li> <li><a href="/wiki/Kjell_N._Lindgren" title="Kjell N. Lindgren">Kjell N. Lindgren</a></li> <li><a href="/wiki/Michael_L%C3%B3pez-Alegr%C3%ADa" title="Michael López-Alegría">Michael López-Alegría</a></li> <li><a href="/wiki/Joseph_B._MacInnis" title="Joseph B. MacInnis">Joseph B. MacInnis</a></li> <li><a href="/wiki/Sandra_Magnus" title="Sandra Magnus">Sandra Magnus</a></li> <li><a href="/wiki/Thomas_Marshburn" title="Thomas Marshburn">Thomas Marshburn</a></li> <li><a href="/wiki/Matthias_Maurer" title="Matthias Maurer">Matthias Maurer</a></li> <li><a href="/wiki/K._Megan_McArthur" title="K. Megan McArthur">K. Megan McArthur</a></li> <li><a href="/wiki/Craig_McKinley_(physician)" title="Craig McKinley (physician)">Craig McKinley</a></li> <li><a href="/wiki/Jessica_Meir" title="Jessica Meir">Jessica Meir</a></li> <li><a href="/wiki/Simone_Melchior" title="Simone Melchior">Simone Melchior</a></li> <li><a href="/wiki/Dorothy_Metcalf-Lindenburger" title="Dorothy Metcalf-Lindenburger">Dorothy Metcalf-Lindenburger</a></li> <li><a href="/wiki/Andreas_Mogensen" title="Andreas Mogensen">Andreas Mogensen</a></li> <li><a href="/wiki/Karen_Nyberg" title="Karen Nyberg">Karen Nyberg</a></li> <li><a href="/wiki/John_D._Olivas" title="John D. Olivas">John D. Olivas</a></li> <li><a href="/wiki/Takuya_Onishi" title="Takuya Onishi">Takuya Onishi</a></li> <li><a href="/wiki/Luca_Parmitano" title="Luca Parmitano">Luca Parmitano</a></li> <li><a href="/wiki/Nicholas_Patrick" title="Nicholas Patrick">Nicholas Patrick</a></li> <li><a href="/wiki/Tim_Peake" title="Tim Peake">Tim Peake</a></li> <li><a href="/wiki/Thomas_Pesquet" title="Thomas Pesquet">Thomas Pesquet</a></li> <li><a href="/wiki/Marc_Reagan" title="Marc Reagan">Marc Reagan</a></li> <li><a href="/wiki/Garrett_Reisman" title="Garrett Reisman">Garrett Reisman</a></li> <li><a href="/wiki/Kathleen_Rubins" title="Kathleen Rubins">Kathleen Rubins</a></li> <li><a href="/wiki/Dick_Rutkowski" title="Dick Rutkowski">Dick Rutkowski</a></li> <li><a href="/wiki/Tara_Ruttley" title="Tara Ruttley">Tara Ruttley</a></li> <li><a href="/wiki/David_Saint-Jacques" title="David Saint-Jacques">David Saint-Jacques</a></li> <li><a href="/wiki/Josef_Schmid_(flight_surgeon)" title="Josef Schmid (flight surgeon)">Josef Schmid</a></li> <li><a href="/wiki/Robert_Sheats" title="Robert Sheats">Robert Sheats</a></li> <li><a href="/wiki/Dewey_Smith" title="Dewey Smith">Dewey Smith</a></li> <li><a href="/wiki/Steve_Squyres" title="Steve Squyres">Steve Squyres</a></li> <li><a href="/wiki/Heidemarie_Stefanyshyn-Piper" title="Heidemarie Stefanyshyn-Piper">Heidemarie Stefanyshyn-Piper</a></li> <li><a href="/wiki/Robert_St%C3%A9nuit" title="Robert Sténuit">Robert Sténuit</a></li> <li><a href="/wiki/Herv%C3%A9_Stevenin" title="Hervé Stevenin">Hervé Stevenin</a></li> <li><a href="/wiki/Nicole_Stott" title="Nicole Stott">Nicole Stott</a></li> <li><a href="/wiki/James_Talacek" title="James Talacek">James Talacek</a></li> <li><a href="/wiki/Daniel_M._Tani" title="Daniel M. Tani">Daniel M. Tani</a></li> <li><a href="/wiki/Robert_Thirsk" title="Robert Thirsk">Robert Thirsk</a></li> <li><a href="/wiki/Bill_Todd" title="Bill Todd">Bill Todd</a></li> <li><a href="/wiki/Mark_T._Vande_Hei" title="Mark T. Vande Hei">Mark T. Vande Hei</a></li> <li><a href="/wiki/Koichi_Wakata" title="Koichi Wakata">Koichi Wakata</a></li> <li><a href="/wiki/Rex_J._Walheim" title="Rex J. Walheim">Rex J. Walheim</a></li> <li><a href="/wiki/Shannon_Walker" title="Shannon Walker">Shannon Walker</a></li> <li><a href="/wiki/John_Morgan_Wells" title="John Morgan Wells">John Morgan Wells</a></li> <li><a href="/wiki/Joachim_Wendler" title="Joachim Wendler">Joachim Wendler</a></li> <li><a href="/wiki/Douglas_H._Wheelock" title="Douglas H. Wheelock">Douglas H. Wheelock</a></li> <li><a href="/wiki/Peggy_Whitson" title="Peggy Whitson">Peggy Whitson</a></li> <li><a href="/wiki/Dafydd_Williams" title="Dafydd Williams">Dafydd Williams</a></li> <li><a href="/wiki/Jeffrey_Williams_(astronaut)" title="Jeffrey Williams (astronaut)">Jeffrey Williams</a></li> <li><a href="/wiki/Sunita_Williams" title="Sunita Williams">Sunita Williams</a></li> <li><a href="/wiki/Reid_Wiseman" title="Reid Wiseman">Reid Wiseman</a></li> <li><a href="/wiki/Kimiya_Yui" title="Kimiya Yui">Kimiya Yui</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Writers and journalists</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Michael_C._Barnette" title="Michael C. Barnette">Michael C. Barnette</a></li> <li><a href="/wiki/Victor_Berge" title="Victor Berge">Victor Berge</a></li> <li><a href="/wiki/Philippe_Diol%C3%A9" title="Philippe Diolé">Philippe Diolé</a></li> <li><a href="/wiki/Gary_Gentile" title="Gary Gentile">Gary Gentile</a></li> <li><a href="/wiki/Bret_Gilliam" title="Bret Gilliam">Bret Gilliam</a></li> <li><a href="/wiki/Bob_Halstead" title="Bob Halstead">Bob Halstead</a></li> <li><a href="/wiki/Hillary_Hauser" title="Hillary Hauser">Hillary Hauser</a></li> <li><a href="/wiki/Trevor_Jackson_(diver)" title="Trevor Jackson (diver)">Trevor Jackson</a></li> <li><a href="/wiki/Steve_Lewis_(diver)" title="Steve Lewis (diver)">Steve Lewis</a></li> <li><a href="/wiki/John_Mattera" title="John Mattera">John Mattera</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Rescuers</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Craig_Challen" title="Craig Challen">Craig Challen</a></li> <li><a href="/wiki/Richard_Harris_(anaesthetist)" title="Richard Harris (anaesthetist)">Richard Harris</a></li> <li><a href="/wiki/Rick_Stanton" title="Rick Stanton">Rick Stanton</a></li> <li><a href="/wiki/John_Volanthen" title="John Volanthen">John Volanthen</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Frogmen</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Lionel_Crabb" title="Lionel Crabb">Lionel Crabb</a></li> <li><a href="/wiki/Ian_Edward_Fraser" title="Ian Edward Fraser">Ian Edward Fraser</a></li> <li><a href="/wiki/Sydney_Knowles" title="Sydney Knowles">Sydney Knowles</a></li> <li><a href="/wiki/James_Joseph_Magennis" title="James Joseph Magennis">James Joseph Magennis</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Commercial salvors</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Keith_Jessop" title="Keith Jessop">Keith Jessop</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Science_of_underwater_diving" style="font-size:114%;margin:0 4em"><a href="/wiki/Science_of_underwater_diving" title="Science of underwater diving">Science of underwater diving</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_researchers_in_underwater_diving" title="List of researchers in underwater diving">List of researchers in underwater diving</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diving_physics" title="Diving physics">Diving<br />physics</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Metre_sea_water" title="Metre sea water">Metre sea water</a></li> <li><a href="/wiki/Neutral_buoyancy" title="Neutral buoyancy">Neutral buoyancy</a></li> <li><a href="/wiki/Underwater_acoustics" title="Underwater acoustics">Underwater acoustics</a> <ul><li><a href="/wiki/Modulated_ultrasound" title="Modulated ultrasound">Modulated ultrasound</a></li></ul></li> <li><a href="/wiki/Underwater_vision" title="Underwater vision">Underwater vision</a> <ul><li><a href="/wiki/Underwater_computer_vision" title="Underwater computer vision">Underwater computer vision</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Diving_physiology" class="mw-redirect" title="Diving physiology">Diving<br />physiology</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diving_reflex#Blood_shift" title="Diving reflex">Blood shift</a></li> <li><a href="/wiki/Cold_shock_response" title="Cold shock response">Cold shock response</a></li> <li><a href="/wiki/Diving_reflex" title="Diving reflex">Diving reflex</a></li> <li><a href="/wiki/Equivalent_narcotic_depth" title="Equivalent narcotic depth">Equivalent narcotic depth</a></li> <li><a href="/wiki/Maximum_operating_depth" title="Maximum operating depth">Maximum operating depth</a></li> <li><a href="/wiki/Physiological_response_to_water_immersion" class="mw-redirect" title="Physiological response to water immersion">Physiological response to water immersion</a></li> <li><a href="/wiki/Thermal_balance_of_the_underwater_diver" title="Thermal balance of the underwater diver">Thermal balance of the underwater diver</a></li> <li><a href="/wiki/Underwater_vision" title="Underwater vision">Underwater vision</a></li> <li><a href="/wiki/Work_of_breathing" title="Work of breathing">Work of breathing</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Decompressiontheory" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Decompression_theory" title="Decompression theory">Decompression<br />theory</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Decompression models: <ul><li><a href="/wiki/B%C3%BChlmann_decompression_algorithm" title="Bühlmann decompression algorithm">Bühlmann decompression algorithm</a></li> <li><a href="/wiki/Haldane%27s_decompression_model" title="Haldane's decompression model">Haldane's decompression model</a></li> <li><a href="/wiki/Reduced_gradient_bubble_model" title="Reduced gradient bubble model">Reduced gradient bubble model</a></li> <li><a href="/wiki/Thalmann_algorithm" title="Thalmann algorithm">Thalmann algorithm</a></li> <li><a href="/wiki/Thermodynamic_model_of_decompression" title="Thermodynamic model of decompression">Thermodynamic model of decompression</a></li> <li><a href="/wiki/Varying_Permeability_Model" title="Varying Permeability Model">Varying Permeability Model</a></li></ul></li> <li><a href="/wiki/Equivalent_air_depth" title="Equivalent air depth">Equivalent air depth</a></li> <li><a href="/wiki/Oxygen_window" title="Oxygen window">Oxygen window</a></li> <li><a href="/wiki/Physiology_of_decompression" title="Physiology of decompression">Physiology of decompression</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Underwater_diving_environment" title="Underwater diving environment">Diving<br />environments</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Underwater_exploration" title="Underwater exploration">Underwater exploration</a> <ul><li><a href="/wiki/Deep-sea_exploration" title="Deep-sea exploration">Deep-sea exploration</a></li></ul></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Classification</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_diving_environments_by_type" title="List of diving environments by type">List of diving environments by type</a></li> <li><a href="/wiki/Altitude_diving" title="Altitude diving">Altitude diving</a></li> <li><a href="/wiki/Benign_water_diving" class="mw-redirect" title="Benign water diving">Benign water diving</a></li> <li><a href="/wiki/Confined_water_diving" class="mw-redirect" title="Confined water diving">Confined water diving</a></li> <li><a href="/wiki/Deep_diving" title="Deep diving">Deep diving</a></li> <li><a href="/wiki/Inland_diving" class="mw-redirect" title="Inland diving">Inland diving</a></li> <li><a href="/wiki/Inshore_diving" class="mw-redirect" title="Inshore diving">Inshore diving</a></li> <li><a href="/wiki/Muck_diving" title="Muck diving">Muck diving</a></li> <li><a href="/wiki/Night_diving" title="Night diving">Night diving</a></li> <li><a href="/wiki/Open-water_diving" title="Open-water diving">Open-water diving</a> <ul><li><a href="/wiki/Black-water_diving" class="mw-redirect" title="Black-water diving">Black-water diving</a></li> <li><a href="/wiki/Blue-water_diving" class="mw-redirect" title="Blue-water diving">Blue-water diving</a></li></ul></li> <li><a href="/wiki/Penetration_diving" title="Penetration diving">Penetration diving</a> <ul><li><a href="/wiki/Cave_diving" title="Cave diving">Cave diving</a> <ul><li><a href="/wiki/Torricellian_chamber" title="Torricellian chamber">Torricellian chamber</a></li></ul></li> <li><a href="/wiki/Ice_diving" title="Ice diving">Ice diving</a></li> <li><a href="/wiki/Wreck_diving" title="Wreck diving">Wreck diving</a></li></ul></li> <li><a href="/wiki/Recreational_dive_sites" title="Recreational dive sites">Recreational dive sites</a></li> <li><a href="/wiki/Underwater_environment" title="Underwater environment">Underwater environment</a></li> <li><a href="/wiki/Underwater_diving_environment" title="Underwater diving environment">Underwater diving environment</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Impact</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Environmental_impact_of_recreational_diving" title="Environmental impact of recreational diving">Environmental impact of recreational diving</a></li> <li><a href="/wiki/Low_impact_diving" title="Low impact diving">Low impact diving</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Other" style="font-size:114%;margin:0 4em">Other</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bathysphere" title="Bathysphere">Bathysphere</a></li> <li><a href="/wiki/Defense_against_swimmer_incursions" title="Defense against swimmer incursions">Defense against swimmer incursions</a> <ul><li><a href="/wiki/Diver_detection_sonar" title="Diver detection sonar">Diver detection sonar</a></li></ul></li> <li><a href="/wiki/Offshore_survey" class="mw-redirect" title="Offshore survey">Offshore survey</a></li> <li><a href="/wiki/Rugged_compact_camera" class="mw-redirect" title="Rugged compact camera">Rugged compact camera</a></li> <li><a href="/wiki/Underwater_domain_awareness" title="Underwater domain awareness">Underwater domain awareness</a></li> <li><a href="/wiki/Underwater_vehicle" title="Underwater vehicle">Underwater vehicle</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Deep-submergence_vehicle" title="Deep-submergence vehicle">Deep-submergence<br />vehicle</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aluminaut" title="Aluminaut"><i>Aluminaut</i></a></li> <li><a href="/wiki/DSV_Alvin" title="DSV Alvin">DSV <i>Alvin</i></a></li> <li><a href="/wiki/American_submarine_NR-1" title="American submarine NR-1">American submarine NR-1</a></li> <li><a href="/wiki/Bathyscaphe" title="Bathyscaphe">Bathyscaphe</a> <ul><li><a href="/wiki/Archim%C3%A8de" title="Archimède"><i>Archimède</i></a></li> <li><a href="/wiki/FNRS-2" title="FNRS-2">FNRS-2</a></li> <li><a href="/wiki/FNRS-3" title="FNRS-3">FNRS-3</a></li> <li><a href="/wiki/Sea_Pole-class_bathyscaphe#Harmony_class_bathyscaphe" title="Sea Pole-class bathyscaphe"><i>Harmony</i> class bathyscaphe</a></li> <li><a href="/wiki/Sea_Pole-class_bathyscaphe" title="Sea Pole-class bathyscaphe"><i>Sea Pole</i>-class bathyscaphe</a></li> <li><a href="/wiki/Bathyscaphe_Trieste_II" class="mw-redirect" title="Bathyscaphe Trieste II"><i>Trieste II</i></a></li></ul></li> <li><a href="/wiki/Deepsea_Challenger" title="Deepsea Challenger"><i>Deepsea Challenger</i></a></li> <li><a href="/wiki/Ictineu_3" title="Ictineu 3"><i>Ictineu 3</i></a></li> <li><a href="/wiki/JAGO_(German_research_submersible)" title="JAGO (German research submersible)"><i>JAGO</i></a></li> <li><a href="/wiki/Jiaolong_(submersible)" title="Jiaolong (submersible)"><i>Jiaolong</i></a></li> <li><a href="/wiki/Konsul-class_submersible" title="Konsul-class submersible"><i>Konsul</i>-class submersible</a></li> <li><a href="/wiki/DSV_Limiting_Factor" title="DSV Limiting Factor"><i>Limiting Factor</i></a></li> <li><a href="/wiki/Russian_submarine_Losharik" title="Russian submarine Losharik">Russian submarine <i>Losharik</i></a></li> <li><a href="/wiki/Mir_(submersible)" title="Mir (submersible)"><i>Mir</i></a></li> <li><a href="/wiki/Nautile" title="Nautile"><i>Nautile</i></a></li> <li><a href="/wiki/Pisces-class_deep_submergence_vehicle" title="Pisces-class deep submergence vehicle"><i>Pisces</i>-class deep submergence vehicle</a></li> <li><a href="/wiki/DSV_Sea_Cliff" title="DSV Sea Cliff">DSV <i>Sea Cliff</i></a></li> <li><a href="/wiki/DSV_Shinkai" title="DSV Shinkai">DSV <i>Shinkai</i></a></li> <li><a href="/wiki/DSV_Shinkai_2000" title="DSV Shinkai 2000">DSV <i>Shinkai 2000</i></a></li> <li><a href="/wiki/DSV_Shinkai_6500" title="DSV Shinkai 6500">DSV <i>Shinkai 6500</i></a></li> <li><a href="/wiki/DSV_Turtle" title="DSV Turtle">DSV <i>Turtle</i></a></li> <li><a href="/wiki/DSV-5_Nemo" title="DSV-5 Nemo">DSV-5 <i>Nemo</i></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Submarine_rescue" title="Submarine rescue">Submarine rescue</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/International_Submarine_Escape_and_Rescue_Liaison_Office" title="International Submarine Escape and Rescue Liaison Office">International Submarine Escape and Rescue Liaison Office</a></li> <li><a href="/wiki/Submarine_Escape_and_Rescue_system_(Royal_Swedish_Navy)" title="Submarine Escape and Rescue system (Royal Swedish Navy)">Submarine Escape and Rescue system (Royal Swedish Navy)</a></li> <li><a href="/wiki/McCann_Rescue_Chamber" title="McCann Rescue Chamber">McCann Rescue Chamber</a></li> <li><a href="/wiki/Submarine_rescue_ship" title="Submarine rescue ship">Submarine rescue ship</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Deep-submergencerescue_vehicle" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Deep-submergence_rescue_vehicle" title="Deep-submergence rescue vehicle">Deep-submergence<br />rescue vehicle</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/LR5" title="LR5">LR5</a></li> <li><a href="/wiki/LR7" title="LR7">LR7</a></li> <li><a href="/wiki/MSM-1" title="MSM-1">MSM-1</a></li> <li><a href="/wiki/Mystic-class_deep-submergence_rescue_vehicle" title="Mystic-class deep-submergence rescue vehicle"><i>Mystic</i>-class deep-submergence rescue vehicle</a> <ul><li><a href="/wiki/DSRV-1_Mystic" title="DSRV-1 Mystic">DSRV-1 <i>Mystic</i></a></li> <li><a href="/wiki/DSRV-2_Avalon" title="DSRV-2 Avalon">DSRV-2 <i>Avalon</i></a></li></ul></li> <li><a href="/wiki/NATO_Submarine_Rescue_System" title="NATO Submarine Rescue System">NATO Submarine Rescue System</a></li> <li><a href="/wiki/Priz-class_deep-submergence_rescue_vehicle" title="Priz-class deep-submergence rescue vehicle"><i>Priz</i>-class deep-submergence rescue vehicle</a> <ul><li><a href="/wiki/Russian_deep_submergence_rescue_vehicle_AS-28" title="Russian deep submergence rescue vehicle AS-28">Russian deep submergence rescue vehicle AS-28</a></li> <li><a href="/wiki/Russian_submarine_AS-34" title="Russian submarine AS-34">Russian submarine AS-34</a></li></ul></li> <li><a href="/wiki/ASRV_Remora" class="mw-redirect" title="ASRV Remora">ASRV <i>Remora</i></a></li> <li><a href="/wiki/SRV-300" title="SRV-300">SRV-300</a></li> <li><a href="/wiki/Submarine_Rescue_Diving_Recompression_System" title="Submarine Rescue Diving Recompression System">Submarine Rescue Diving Recompression System</a></li> <li><a href="/wiki/Type_7103_DSRV" class="mw-redirect" title="Type 7103 DSRV">Type 7103 DSRV</a></li> <li><a href="/wiki/URF_(Swedish_Navy)" title="URF (Swedish Navy)">URF (Swedish Navy)</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/w/index.php?title=Submarine_escape&action=edit&redlink=1" class="new" title="Submarine escape (page does not exist)">Submarine escape</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Escape_trunk" title="Escape trunk">Escape trunk</a></li> <li><a href="/wiki/Submarine_escape_training_facility" title="Submarine escape training facility">Submarine escape training facility</a></li> <li><a href="/wiki/Submarine_Escape_Training_Facility_(Australia)" title="Submarine Escape Training Facility (Australia)">Submarine Escape Training Facility (Australia)</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Escape_set" scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Escape_set" class="mw-redirect" title="Escape set">Escape set</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Davis_Submerged_Escape_Apparatus" title="Davis Submerged Escape Apparatus">Davis Submerged Escape Apparatus</a></li> <li><a href="/wiki/Momsen_lung" title="Momsen lung">Momsen lung</a></li> <li><a href="/wiki/Steinke_hood" title="Steinke hood">Steinke hood</a></li> <li><a href="/wiki/Submarine_Escape_Immersion_Equipment" title="Submarine Escape Immersion Equipment">Submarine Escape Immersion Equipment</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Special<br />interest<br />groups</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Artificial_Reef_Society_of_British_Columbia" title="Artificial Reef Society of British Columbia">Artificial Reef Society of British Columbia</a></li> <li><a href="/wiki/CMAS_Europe" title="CMAS Europe">CMAS Europe</a></li> <li><a href="/wiki/Coral_Reef_Alliance" title="Coral Reef Alliance">Coral Reef Alliance</a></li> <li><a href="/wiki/Divers_Alert_Network" title="Divers Alert Network">Divers Alert Network</a></li> <li><a href="/wiki/Green_Fins" title="Green Fins">Green Fins</a></li> <li><a href="/wiki/Finger_Lakes_Underwater_Preserve_Association" title="Finger Lakes Underwater Preserve Association">Finger Lakes Underwater Preserve Association</a></li> <li><a href="/wiki/Karst_Underwater_Research" title="Karst Underwater Research">Karst Underwater Research</a></li> <li><a href="/wiki/Nautical_Archaeology_Program" title="Nautical Archaeology Program">Nautical Archaeology Program</a></li> <li><a href="/wiki/Nautical_Archaeology_Society" title="Nautical Archaeology Society">Nautical Archaeology Society</a></li> <li><a href="/wiki/Naval_Air_Command_Sub_Aqua_Club" title="Naval Air Command Sub Aqua Club">Naval Air Command Sub Aqua Club</a></li> <li><a href="/wiki/PADI_AWARE" title="PADI AWARE">PADI AWARE</a></li> <li><a href="/wiki/Reef_Check" title="Reef Check">Reef Check</a></li> <li><a href="/wiki/Reef_Life_Survey" title="Reef Life Survey">Reef Life Survey</a></li> <li><a href="/wiki/Rubicon_Foundation" title="Rubicon Foundation">Rubicon Foundation</a></li> <li><a href="/wiki/Save_Ontario_Shipwrecks" title="Save Ontario Shipwrecks">Save Ontario Shipwrecks</a></li> <li><a href="/wiki/SeaKeys" title="SeaKeys">SeaKeys</a></li> <li><a href="/wiki/Sea_Research_Society" title="Sea Research Society">Sea Research Society</a></li> <li><a href="/wiki/Society_for_Underwater_Historical_Research" title="Society for Underwater Historical Research">Society for Underwater Historical Research</a></li> <li><a href="/wiki/Society_for_Underwater_Technology" title="Society for Underwater Technology">Society for Underwater Technology</a></li> <li><a href="/wiki/Underwater_Archaeology_Branch,_Naval_History_%26_Heritage_Command" title="Underwater Archaeology Branch, Naval History & Heritage Command">Underwater Archaeology Branch, Naval History & Heritage Command</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Neutral buoyancy<br />facilities for<br />Astronaut training</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Neutral_Buoyancy_Laboratory" title="Neutral Buoyancy Laboratory">Neutral Buoyancy Laboratory</a></li> <li><a href="/wiki/Neutral_buoyancy_pool" title="Neutral buoyancy pool">Neutral buoyancy pool</a></li> <li><a href="/wiki/Neutral_buoyancy_simulation_as_a_training_aid" title="Neutral buoyancy simulation as a training aid">Neutral buoyancy simulation as a training aid</a></li> <li><a href="/wiki/Neutral_Buoyancy_Simulator" title="Neutral Buoyancy Simulator">Neutral Buoyancy Simulator</a></li> <li><a href="/wiki/Space_Systems_Laboratory_(Maryland)" title="Space Systems Laboratory (Maryland)">Space Systems Laboratory</a></li> <li><a href="/wiki/Yuri_Gagarin_Cosmonaut_Training_Center" title="Yuri Gagarin Cosmonaut Training Center">Yuri Gagarin Cosmonaut Training Center</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Nautilus_Productions" title="Nautilus Productions">Nautilus Productions</a></li> <li><a href="/wiki/Helicopter_Aircrew_Breathing_Device" title="Helicopter Aircrew Breathing Device">Helicopter Aircrew Breathing Device</a></li> <li><a href="/wiki/Scuba_diving_therapy" title="Scuba diving therapy">Scuba diving therapy</a></li> <li><a href="/wiki/Seabed_mining" title="Seabed mining">Seabed mining</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="font-weight: bold;"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" 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