Index of underwater diving

Alphabetical listing of underwater diving related topics
See the Glossary of underwater diving terminology for definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
See the Outline of underwater diving for a hierararchical listing of underwater diving related articles
See the Index of underwater divers for an alphabetical listing of articles about underwater divers
See the Index of recreational dive sites for an alphabetical listing of articles about places which are recreational dive sites

The following index is provided as an overview of and topical guide to underwater diving:

Two divers wearing lightweight demand helmets stand back-to-back on an underwater platform holding on to the railings. The photo also shows the support vessel above the surface in the background.
Surface-supplied divers riding a stage to the underwater workplace

Underwater diving can be described as all of the following:

  • A human activity – intentional, purposive, conscious and subjectively meaningful sequence of actions. Underwater diving is practiced as part of an occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to order of a day at a time, either exposed to the ambient pressure or isolated by a pressure resistant suit, to interact with the underwater environment for pleasure, competitive sport, or as a means to reach a work site for profit or in the pursuit of knowledge, and may use no equipment at all, or a wide range of equipment which may include breathing apparatus, environmental protective clothing, aids to vision, communication, propulsion, maneuverability, buoyancy and safety equipment, and tools for the task at hand.

1 – 9

  • 14th CMAS Underwater Photography World Championship – 2013 photography competition held in Cuba
  • 1973 Mount Gambier cave diving accident – Scuba cave diving incident in South Australia
  • 1982 invasion of the Falkland Islands – Argentine invasion of the Falklands
  • 1992 cageless shark-diving expedition – First recorded cageless dive with great white sharks
  • 2011 Finswimming World Championships – 2011 swimming competition held in Hungary
  • 2013 Finswimming World Championships – International competition in Kazan, Russia
  • 2016 Finswimming World Championships – International competition in Volos, Greece
  • 2018 Finswimming World Championships – International competition in Belgrade, Serbia
  • 35-ton deep-submergence rescue vehicle – Chinese Navy submarine rescue submersible
  • 8A4-class ROUV – Chinese work class remotely operated underwater vehicle

A

  • AAI underwater revolver – Six-round amphibious revolver for naval use
  • A Blueprint for Survival (cave diving) – Book on cave diving safety by Sheck Exley
  • ABISMO – Japanese remotely operated underwater vehicle for deep sea exploration
  • ABLJ – Configuration of diving buoyancy compensator
  • Acoustic beacon – Device that emits a sound signal to aid location underwater
  • Acoustic positioning system – System for tracking and navigation of underwater vehicles or divers using acoustic signals
  • Active addition rebreather – Semi closed circuit rebreather type
  • Adaptive Support Diver – Scuba diver trained to support divers with disabilities
  • Administrative controls – Industrial safety
  • ADS 2000 atmospheric diving system – US Navy armoured diving suit
  • ADS amphibious rifle – Russian bullpup assault rifle for combat divers
  • Advanced European Scientific Diver – A diver competent to organise a scientific diving team
  • Advanced Open Water Diver – Recreational scuba diving certification slightly above minimum entry level
  • Advanced open-water diver – Recreational scuba diving certification slightly above minimum entry level
  • Advanced nitrox diver – Technical diving qualification to use multiple mixtures of oxygen enriched air
  • Advanced SEAL Delivery System – Former Navy SEAL mini-sub deployed from submarines
  • Advanced trimix diver – Recreational technical diving certification level
  • Aerosinusitis – Barotrauma of the sinuses
  • Aerospace Medical Association – Professional organization in aviation, space, hyperbaric and environmental medicine
  • AIDA Hellas – National representative of AIDA International in Greece
  • AIDA International (AIDA) – Worldwide rule- and record-keeping body for competitive breath-hold events
  • Air embolism – Vascular blockage by air bubbles
  • Airlift (dredging device), also known as air-lift – Dredging device using injected air to move water and entrained load up a pipe
  • Airlift dredging – Removing underwater sediment using an airlift pump
  • Air line – Tube or hose carrying a compressed air supply
  • Air-line diving, also known as airline diving – Basic mode of surface-supplied underwater diving
  • Airlock, also known as air-lock – Compartment for transfer between environments with different atmospheres
  • Air lock diving bell – Type of mobile pressure caisson
  • Air lock diving-bell plant – Underwater work support barge used at Gibraltar
  • Air spread – The topside base for surface-supplied air diving operations
  • Air top, also known as air top-up – Modifying or completing a gas blend by adding compressed air
  • Alert Diver – Quarterly magazine published by DAN
  • Algal bloom – Spread of planktonic algae in water
  • Alpazat cave rescue – Six British soldiers trapped in a flooded Mexican cave
  • Al-Sabehat – Iranian swimmer delivery vehicle
  • Alternative air source – Emergency supply of breathing gas for an underwater diver
  • Alternative air supply – Emergency supply of breathing air for an underwater diver
  • Alternative gas supply – Emergency breathing gas supply
  • Alternobaric vertigo – Dizziness resulting from unequal pressures in the middle ears
  • Altitude decompression – Reduction in ambient pressure due to ascent above sea level
  • Altitude diver – Diver competent to plan decompression at altitude
  • Altitude Diver – Diver qualification for the skills to decompress at altitude
  • Altitude diving – Underwater diving at altitudes above 300 m
  • Aluminaut – First aluminum hulled submarine
  • Ama (diving) – Japanese pearl divers
  • Ambient pressure – Pressure of the surrounding medium
  • American Academy of Underwater Sciences (AAUS) – American diving standards organisation
  • American Canadian Underwater Certifications (ACUC) – Recreational diver training and certification agency
  • American Nitrox Divers International (ANDI) – Recreational diver training and certification agency
  • Amontons' law – Relationship between pressure and temperature of a gas at constant volume
  • Anchor pattern – Arrangement of anchors allowing precise positioning of a vessel
  • Anti-fog – Chemicals that prevent the condensation of water as small droplets on a surface
  • Anti-frogman techniques – Methods of protection from incursions by divers and swimmers
  • AN/WQX-2 – Diver detection sonar used in defense against underwater incursions
  • Ankle strap (diving) – Staps worn over the ankles of dry suits to prevent the boots from pulling off when in use
  • Ankle weights (diving) – Diver trim weights worn at the ankles
  • ANMP – Association nationale des moniteurs de plongée
  • ANSTI breathing simulator – Machine to measure work of breathing of diving apparatus
  • ANSTI machine – Machine to measure work of breathing of diving apparatus
  • Anti-fog – Chemicals that prevent the condensation of water as small droplets on a surface
  • Anti-frogman techniques – Methods of protection from incursions by divers and swimmers
  • Antipodes (submersible) – Commercial submarine built in 1973
  • Anxiety – Unpleasant state of inner turmoil over anticipated events
  • AP Diving – British manufacturer of underwater diving equipment
  • Apeks – British manufacturer of scuba diving equipment
  • Apnea blackout – Loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold dive
  • Apnea finswimming, also known as Apnoea finswimming – Underwater swimming in a swimming pool using mask, monofin and holding one's breath.
  • Apparent weight – Weight of an object when a force additional to gravity is present
  • APS underwater rifle – Soviet underwater assault firearm firing unrifled steel flechettes
  • Aqua Lung America – American company manufacturing recreational diving equipment
  • Aqua Lung/La Spirotechnique – French company manufacturing breathing apparatus and diving equipment
  • Aqua-Lung – Original name for open-circuit scuba equipment
  • Aquanaut – Diver who remains at depth underwater for longer than 24 hours
  • Aquarium diving – Occupational diving in large aquariums
  • Aquascope – Underwater viewing device
  • Aquathlon (underwater wrestling) – Competitive underwater wrestling
  • Aqueon – Diver powered propulsion device
  • Archaeological diving – Method in underwater archaeology
  • Archaeology of shipwrecks – Study of human activity through the analysis of shipwreck artifacts
  • Archimède – French Navy bathyscaphe
  • Argox – Gas mixture occasionally used by scuba divers for dry-suit inflation
  • Archimedes' principle – Buoyancy principle in fluid dynamics
  • Army engineer diver – Armed forces occupation
  • Army Ranger Wing – Special operations force of the Irish Defence Forces
  • Artificial gills (human) – Hypothetical devices to extract oxygen from water
  • Artificial reef – Human-made underwater structure that functions as a reef
  • Artificial Reef Society of British Columbia (ARSBC) – Canadian non-profit to create artificial reefs for habitat enhancement and recreation
  • AR vest – Type of jacket harness for surface-supplied diving
  • Ascending and descending (diving) – Procedures for safe ascent and descent in underwater diving
  • Ascent and descent (diving) – Procedures for safe ascent and descent in underwater diving
  • Ascent blackout – Loss of consciousness caused by cerebral hypoxia on ascending from a deep freedive
  • Ascents and descents (diving) – Procedures for safe ascent and descent in underwater diving
  • Asphyxia – Severely deficient supply of oxygen
  • Assisted ascent – An emergency ascent during which the diver is provided with breathing gas by another diver
  • Association nationale des moniteurs de plongée – French recreational diver training and certification agency
  • Association of Diving Contractors International (ADCI) – Non-profit organization for promoting standards and knowledge for commercial diving
  • Atlantis ROV Team – High-school underwater robotics team from Whidbey Island, Washington, United States
  • Atmospheric diving suit – Articulated pressure resistant anthropomorphic housing for an underwater diver
  • ASM-DT amphibious rifle – Russian folding stock underwater firearm
  • Association nationale des moniteurs de plongée (ANMP) – French recreational diver training and certification agency
  • Atmospheric diving suit – Articulated pressure resistant anthropomorphic housing for an underwater diver
  • Atmospheric diving system – Diving equiment that isolates the diver from ambient pressure
  • Atmospheric pressure diving – Articulated pressure resistant housing for underwater diver
  • Atmospheric suit diving – Diving in an articulated pressure resistant anthropomorphic housing
  • Atmospheric pressure – Static pressure exerted by the weight of the atmosphere
  • Atrial septal defect – Human heart defect present at birth
  • Attitude (diver) – Alignment of the priciple axes of a diver in the water
  • Australian Diver Accreditation Scheme (ADAS) – Australian based international occupational diver accreditation organisation
  • Australian Submarine Rescue Vehicle Remora – Diving bell operated by the Australian Navy
  • Australian Underwater Federation (AUF) – Governing body for underwater sports in Australia
  • Auto-dump valve – Valve to release excess gas from a dry suit
  • Automatic diluent valve – Demand valve to maintain volume of a rebreather loop
  • Autonomous diver, also known as Autonomous Diver or Autonomous scuba diver – International minimum standard for entry level recreational scuba diver certification
  • Autonomous Robotics Ltd – UK company developing an autonomous underwater vehicle
  • Autonomous underwater vehicle – Unmanned underwater vehicle with autonomous guidance system
  • AUV-150 – Unmanned underwater vehicle in development in by Central Mechanical Engineering Research Institute
  • AUV Abyss – Autonomous underwater vehicle for mapping of the seabed and water column data collection
  • Avascular necrosis – Death of bone tissue due to interruption of the blood supply

B

  • Bachrach, Arthur J. – American psychologist and administrator (1923–2011)
  • Back gas – Scuba breathing gas carried on the back of the diver
  • Back kick (finning) – Finning technique to move backwards
  • Back-mounted scuba – Scuba set carried on the diver's back
  • Backplate and wing – Type of back-mount scuba harness
  • Bail out to open circuit – Abort a rebreather dive and surface using open circuit scuba
  • Bail-out cylinder – Emergency gas supply cylinder carried by a diver
  • Bailout (diving) – To switch over to an emergency system during a dive
  • Bailout block – Valve block on diver's equipment for switching between main and emergency gas supply
  • Bailout bottle – Emergency gas supply cylinder carried by a diver
  • Bailout gas – Emergency breathing gas supply carried by the diver
  • Bailout rebreather – Diving rebreather carried as an emergency gas supply
  • Bailout set – Emergency gas supply scuba carried by a diver
  • Bailout system – System to provide emergency breathing gas to a diver
  • Bailout to open circuit – Abort a rebreather dive and surface using open circuit scuba
  • Bailout valve – Valve opening the supply of emergency breathing gas
  • Bailout valve (rebreather) – Valve on rebreather mouthpiece to switch to emergency gas supply
  • Baited remote underwater video – Equipment for estimating fish populations
  • Band mask – Heavy duty full-face diving mask for surface-supplied diving
  • Barodontalgia – Tooth pain caused by ambient pressure change
  • Barostriction – Obstruction of pressure equalization passages
  • Barotrauma – Injury caused by pressure
  • Barotrauma of ascent – Injuries caused by a reduction in ambient pressure
  • Barotraumas of decompression – Injuries caused by a reduction in ambient pressure
  • Barton, Otis – American diver and actor (1899–1992)
  • Basic Cave Diving: A Blueprint for Survival – Book on cave diving safety by Sheck Exley
  • Basic life support – Emergency medical care by first responder
  • Bathyscaphe – Free-diving self-propelled deep-sea submersible
  • Beebe, William – American ornithologist, marine biologist, entomologist, and explorer (1877–1962)
  • Behnke, Albert R. – US Navy physician and diving medicine researcher
  • Belize Barrier Reef – Series of coral reefs straddling the coast of Belize
  • Bell bounce diving – Surface oriented diving using a closed bell
  • Bell cursor – Device to guide and control a diving bell near and above the surface
  • Bell gas panel – Group of hoses and cables provifing services to a diving bell
  • Bell harness – Underwater diving safety haeness
  • Bell stage – Platform below the chamber of a closed diving bell
  • Bell umbilical – Bundle of hoses and cables providing services to a diving bell
  • Bell-bounce dive – Surface-oriented diving in a closed bell
  • Bellman (diver) – Diver working as standby diver and umbilical attendant from a diving bell
  • Bellman (diving) – The member of a dive team who acts as stand-by diver and tender from the diving bell
  • Benign water – Diving environment with very low risk
  • Benign water diving – Diving in environments of low risk
  • Bering Sea Gold – Television series
  • Bering Sea Gold: Under The Ice – RedirectPages displaying short descriptions with no spaces
  • Bert, Paul – French zoologist, physiologist and politician (1833–1886)
  • Beuchat – French manufacturer of underwater diving equipment
  • Bifin – Swimfin type with single foot pocket
  • Biological hazard – Biological material that poses serious risks to the health of living organisms
  • Black-water (diving) – Oceanic mid-water at night
  • Black-water diving – Open ocean mid-water diving at night
  • Blackout of ascent – Loss of consciousness caused by cerebral hypoxia on ascending from a deep freedive
  • Blood–air barrier – Membrane separating alveolar air from blood in lung capillaries
  • A Blueprint for Survival (cave diving) – Cave diving safety manual by Sheck Exley
  • Blauhöhle – Flooded cave system in Southern Germany
  • Blood shift – Set index article
  • Blood shift (diving) – Blood flow to the extremities redistributed to the head and torso during a breathhold dive
  • Blood–air barrier – Membrane separating alveolar air from blood in lung capillaries
  • Błotniak – One-man wet cabin underwater craft designed in Poland in 1978
  • Blue Grotto (Malta) – Sea caverns in Malta
  • Blue hole – Marine cavern or sinkhole, open to the surface, in carbonate bedrock
  • Blue Hole (New Mexico) – Sinkhole used for scubadiving in New Mexico, United States
  • Blue Hole (Red Sea) – Submarine sinkhole north of Dahab, Egypt
  • Blue Lake (Utah) – Large geothermal pond in Utah, U.S.
  • Blue water diving – Diving in mid-water where the bottom is out of sight
  • Blue-water (diving) – Oceanic mid-water
  • Blue-water diving – Underwater diving in oceanic mid-water where the bottom is not visible and is out of diving range
  • Boarding stirrup – A suspended step to help divers lift themselves from the water into a boat
  • Boat diving – Procedures specific to diving from boats
  • Boaty McBoatface – British autonomous underwater vehicle
  • Bolt snap – Sprung slide gated snap hook
  • Bond, George F. – US Navy physician and diving medicine and saturation diving researcher
  • Booster pump – Machine to increase pressure of a fluid
  • Bottom gas – Gas breathed during the deep part of a dive
  • Bottom time – The elapsed time of a dive from starting the descent to starting the final ascent to the surface
  • Bottom timer – An electronic instrument that records depth and elapsed time data on an underwater dive
  • Boyle, Robert – Anglo-Irish scientist (1627–1691)
  • Boyle's law – Relation between gas pressure and volume
  • Boyle, Robert – Anglo-Irish scientist (1627–1691)
  • Bradner, Hugh – American physicist, neoprene wetsuit inventor (1915–2008)
  • Brazilian commando frogmen – GRUMEC is the special forces unit of the Brazilian Navy
  • Breaking wave, also known as surf – Wave that becomes unstable as a consequence of excessive steepness
  • Breath-hold blackout – Loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold dive
  • Breathing – Process of moving air in and out of the lungs
  • Breathing air – Air quality suitable for safe breathing
  • Breathing air compressor – Machine that compresses atmospheric air at breathing gas quality
  • Breathing apparatus – Equipment allowing or assisting the user to breath in a hostile environment
  • Breathing gas – Gas used for human respiration
  • Breathing gas analysis – Detection and measurement of components of a breathing gas
  • Breathing gas quality – Purity requirements for gases for human breathing
  • Breathing gas reclaim system – Equipment to recover helium based breathing gas after use by divers
  • Breathing gas switch – Changing between breathing gasses of different composition while diving
  • Breathing loop – Breathing gas circuit in a rebreather
  • Breathing performance of regulators – Tests of underwater breathing apparatus
  • Breathing set – Equipment allowing or assisting the user to breath in a hostile environment
  • Breathing tube (breathing apparatus) – Tube through which to breath ambient pressure air
  • Briggs Marine – A marine services company based in the United Kingdom
  • British commando frogmen – Special Boat Service, whose members are drawn largely from the Royal Marines
  • British Divers Marine Life Rescue – United Kingdom charity organisation
  • British Freediving Association (BFA) – British affiliate to AIDA International
  • British Octopush Association (BOA) – National body for underwater hockey in the United Kingdom
  • British Sub-Aqua Club (BSAC) – Recreational diving club, training and certification agency based in the UK
  • British Underwater Sports Association (BUSA) – British affiliate to the world underwater federation sports committee.
  • Brubakk, Alf O. – Norwegian decompression researcher (1941–2022)
  • BRUV – Video system for estimating fish populations
  • BSAC First Class Diver – Recreational diver competent to lead a group of dives carrying out a project
  • BSAC London Branch – Original British Sub-Aqua Club branch
  • Buddy bottle – Alternative name for scuba bailout set
  • Buddy breathing – Technique for sharing breathing gas from a single mouthpiece
  • Buddy check – Pre-dive safety checks carried out by two-diver dive teams
  • Buddy diver – Person diving by the buddy system
  • Buddy diving – Practice of mutual monitoring and assistance between two divers
  • Buddy line – A tether between two scuba divers to prevent separation in low visibility
  • Bühlmann, Albert A. – Swiss physician and decompression researcher (1923–1994)
  • Bühlmann decompression algorithm, also known as Buhlmann algorithm – Mathematical model of tissue inert gas uptake and release with pressure change
  • Bühlmann decompression model – Mathematical model of tissue inert gas uptake and release with pressure change
  • Built-in breathing set – System for supply of breathing gas on demand within a confined space
  • Built-in breathing system (BIBS) – System for supply of breathing gas on demand within a confined space
  • Built-in breathing system regulator – Hyperbaric chamber breathing regulators that exhaust externally
  • Buoyancy – Upward force that opposes the weight of an object immersed in fluid
  • Buoyancy compensator (BCD), also known as buoyancy control device – Equipment for controlling the buoyancy of a diver
  • Buoyancy compensator inflation hose – Inflation gas supply hose on scuba regulator
  • Buoyancy control (disambiguation)
  • Buoyancy control in scuba diving, also known as buoyancy control (scuba) – Essential safety skill
  • Buoyancy control equipment – Diving equipment primarily intended to modify buoyancy of the diver
  • Buoyant ascent – Type of emergency ascent in diving
  • Byford Dolphin – Semi-submersible offshore drilling rig
  • Byford Dolphin diving bell accident – Explosive decompression of an occupied saturation chamber
  • Burst disc, also known as rupture disc – Non-closing over-pressure relief device

C

D

E

F

G

  • Gaiters (diving) – Accessories used to restrict volume of a dry suit over the lower legs
  • Gas blender – Person who blends breathing gas mixtures for scuba diving and fills diving cylinders
  • Gas blending – Producing special gas mixtures to specification
  • Gas blending for scuba diving – Mixing and filling cylinders with breathing gases for use when scuba diving
  • Gas booster – Machine to increase the pressure of compressed gas
  • Gas endurance – The time a gas supply will last
  • Gas exchange – Process by which gases diffuse through a biological membrane
  • Gas extender – Type of semi-closed circuit diving rebreather
  • Gas-integrated dive computer – A dive computer that displays the pressure of breathing gas remaining in the cylinder
  • Gas laws – Scientific description of the behaviour of gases as physical conditions vary
  • Gas man – Person who controls the breathing gas supply to a surface-supplied mixed-gas diver
  • Gas matching – Ensuring that reserve breathing gas is sufficient to supply the dive buddy
  • Gas panel – Breathing gas distribution panel for surface-supplied diving
  • Gas-reclaim system – Equipment to recover exhaled gas from a diver to tecover the helium content
  • Gas storage bank – Group of similar size high pressure cylinders mounted together and connected to a common manifold
  • Gas storage quad – Group of similar size high pressure cylinders
  • Gas storage tube – Large volume, high pressure gas storage cylinder
  • Gas switch – Changing the breathing gas mixture during a dive
  • Gas switching – Changing the breathing gas mixture during a dive
  • Gas toxicity – Degree of harmfulness of gases
  • Gay-Lussac's law – Relationship between pressure and temperature of a gas at constant volume
  • German commando frogmen – German postwar commando amphibious warfare force
  • Global Explorer ROV – Deep water science and survey remotely operated vehicle
  • Global Underwater Explorers (GUE) – Recreational/technical scuba training and certification agency
  • Glossary of breathing apparatus terminology – Definitions of technical terms used in connection with breathing apparatus
  • Glossary of underwater diving terminology, also known as Glossary of underwater diving terms or Glossary of SCUBA diving – Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
  • Glossary of underwater diving terminology: A–C – Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
  • Glossary of underwater diving terminology: D–G – Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
  • Glossary of underwater diving terminology: H–O – Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
  • Glossary of underwater diving terminology: P–S – Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
  • Glossary of underwater diving terminology: T–Z – Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
  • Goldfinder – Autobiography of British diver and treasure hunter Keith Jessop
  • Gold Rush: White Water – American television series
  • Goldfish-class ROUV – Light class of Chinese remotely operated underwater vehicle
  • Goodman handle – Mounting which holds a dive light on the back of the diver's hand
  • Gradient factor – Method for adjusting conservatism of decompression algorithms
  • Gradient factor in decompression modelling – A way for users to adjust the conservatism of a decompression algorithm in software
  • Green Fins – Organisation in South East Asia for preservation of coral reefs by improving diver behavior
  • GROM Military Unit – Polish special forces unit
  • GRUMEC, also known as Brazilian commando frogmen – Brazilian Navy special forces diving unit
  • Guide line – Line deployed by scuba divers for navigation
  • Gyrojet – Firearm that fires small rocket projectiles

H

I

J

  • Jacket harness – Type of surface-supplied diving safety harness
  • Jackstay – Substantial line between two points used to guide or support.
  • Jackstay (diving) – Substantial underwater guide line
  • Jackstay search – Underwater search along a laid down line
  • Jagdkommando – Austrian Armed Forces' Special Operations group
  • JAGO (German research submersible) – Manned German research submersible
  • Jersey upline – A buoyed line serving as a position control during decompression
  • JIM suit – Type of atmospheric diving suit.
  • Job safety analysis (JSA) – Procedure to integrate safety practices into a particular task
  • Johnson Sea Link accident – Manned submersible incident in which two divers died
  • Jonline – A short line used by scuba divers to clip themselves to something
  • Jump jacket – Surface-supplied diving safety harness with buoyancy compensation
  • Jump spool – Diving navigation and safety equipment

K

  • Kaikō ROV – Japanese remotely operated underwater vehicle for deep sea exploration
  • Kaşif ROUV – Turkish remotely operated underwater vehicle
  • Klingert, Karl Heinrich – German mechanic and inventor of an early surface-supplied diving suit.
  • Karst Underwater Research – Non-profit organization that specializes in the research and documentation of karst aquifers
  • Kayak diving – Recreational diving from a canoe or kayak
  • Keel weight (diving) – Weight added to a diver's backplate
  • Kilsby sinkhole – Sinkhole in Mount Gambier, Southern Australia.
  • Kimiuo Aisek Memorial Museum – Museum in Chuuk State, Federated States of Micronesia
  • KISS (rebreather) – Manual closed circuit mixed gas rebreather
  • Kommando Spezialkräfte Marine – German postwar commando amphibious warfare force
  • Kongsberg Mesotech – Manufacturer of sonar equipment for underwater imaging and detection
  • Konsul-class submersible – Russian Navy deep sea submergence vehicle
  • KOPASKA – Indonesian Navy special operations and demolition unit
  • Kreeft, Peter – 18th Century German inventor and diver
  • Kronan (ship) – Swedish Navy ship of the 1670s
  • Kursk submarine disaster salvage operation – Raising the wreck of a Russian nuclear submarine

L

M

N

O

  • Observation bell – Closed diving bell used as an observation platform
  • Occupational diver – Person who dives underwater as part of their occupation
  • Occupational diver training – Training of people employed as underwater divers
  • Occupational diving – Underwater diving which is part of the job
  • Occupational exposure limit – Upper limit on the acceptable concentration of a hazardous substance
  • Occupational hazard – Hazard experienced in the workplace
  • Occupational Health and Safety Act, 1993 – South African statutory law administered by the Department of Labour
  • Occupational hygiene – Management of workplace health hazards
  • Occupational safety and health, also known as Occupational health and safety – Field concerned with the safety, health and welfare of people at work
  • Ocean current – Directional mass flow of oceanic water generated by external or internal forces
  • Ocean Guardian (Shark Shield) – Personal electromagnetic field shark deterrent device
  • Ocean stratification – Layering of ocean water due to density differences
  • Oceanic Worldwide – American recreational scuba equipment manufacturer
  • Octopus demand valve – Secondary demand valve on a scuba regulator
  • Octopus regulator – Secondary demand valve on a scuba regulator
  • Offshore commercial diving – Professional diving in support of the oil and gas industry
  • Offshore diving – Diving outside the territorial waters of a country
  • Offshore survey – Discipline of hydrographic survey largely concerned with the oil industry
  • Omitted decompression – Missed obligatory decompression stops
  • Omitted decompression procedure – Procedure to reduce risk of developing decompression sickness
  • Open circuit breathing apparatus – Breathing apparatus where the exhaled gas is lost to the environment
  • Open circuit demand helmet – Diving helmet which provides gas on inhalation and exhausts to the surroundings
  • Open ocean diving – Diving in deep water out of sight of land
  • Open water (diving) – Unrestricted water with direct vertical access to the surface in contact with the atmosphere
  • Open Water Diver – Entry-level autonomous diver certification for recreational scuba diving
  • Open-water diving – Diving in unrestricted water when the diver has unresricted vertical access to the surface
  • OpenROV – Open-source remotely operated underwater vehicle
  • Operation Algeciras – Argentine plan to sabotage a British warship in Gibraltar
  • Operation Source – Second World War Royal Navy midget submarine attacks on heavy German warships in Norway
  • Operation Thunderhead – American amphibious mission during the Vietnam War
  • Operational Diving Division (SA Navy) – Diving component of the South African Navy's Maritime Reaction Squadron
  • Operations manual – Authoritative document of how things should be done in an organisation
  • Oral-nasal mask – Breathing mask that covers the mouth and the nose only.
  • Orca Edge – First commercially viable personal decompression computer
  • Orinasal mask – Breathing mask that covers the mouth and the nose only.
  • Osprey Reef – Submerged atoll in the Coral Sea, northeast of Queensland, Australia
  • Outline of recreational dive sites – Hierarchical outline list of articles about rereational dive sites
  • Outline of underwater divers – Hierarchical outline list of biographical articles about underwater divers
  • Outline of underwater diving – Hierarchical outline list of articles related to underwater diving
  • Overfall – Dangerous seas due to opposing currents and wind or strong currents over a shallow rocky bottom.
  • Overconfidence effect – Personal cognitive bias
  • Overhead (diving) – A physical or physiological constraint to an immediate direct vertical ascent to the surface
  • Overhead environment – Environment with a physical constraint to a direct vertical ascent to the surface
  • Over-learning, also known as Overlearning – Practicing newly acquired skills beyond the point of initial mastery
  • Overpressure valve (rebreather loop) – Pressure relief valve on a breathing loop
  • Oxygen analyser – Instrument to measure partial pressure of oxygen in a gas mixture
  • Oxygen cleaning – Removal of contaminants that might cause a fire hazard in a n oxygen rich environment
  • Oxygen compatibility – Usability in high-oxygen environments
  • Oxygen enriched air – Air with added oxygen
  • Oxygen fraction – The molar or volumetric fraction of oxygen in a gas
  • Oxygen prebreathing – Procedure to reduce risk of decompression sickness before hypobaric exposure
  • Oxygen service – Use in contact with high partial pressures of oxygen
  • Oxygen therapy – Use of oxygen as a medical treatment
  • Oxygen toxicity – Toxic effects of breathing oxygen at high partial pressures
  • Oxygen window – Physiological effect of oxygen metabolism on the total dissolved gas concentration in venous blood
  • Oxygen window in technical diving – Physiological effect of metabolism on total dissolved gas load in venous blood

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  • T1200 Trenching Unit – Remotely operated seabed trenching unit
  • Tactical Divers Group – Special operations force of the Argentine Navy.
  • Taifib – Indonesian amphibious reconnaissance unit
  • Talus cave – Cave formed by rockfall debris
  • Tank weight – Ballast weight attached to a scuba cylinder
  • Taravana – Decompression sickness after breath-hold diving
  • Task loading – Relationship between operator capacity and the accumulated activities that must be done
  • Teaching method – Principles and methods used by teachers to enable student learning
  • Team redundancy – System for sharing backup equipment and skill diversity
  • Technical diver training – Processes to develop skills and knowledge to dive safely for technical diving
  • Technical diving – Extended scope recreational diving
  • Technical Diving International (TDI) – Technical diver training and certification agency
  • Technical Extended Range (TXR) – Recreational scuba and freediving training and certification agency
  • Tektite habitat – Undersea laboratory and experimental habitat
  • Temperate reef – Hard benthic substrate and ecosystems in cool to cold water in middle latitudes
  • Temperature – Physical quantity of hot and cold
  • Tension-leg platform – Type of offshore platform used in production of oil or gas
  • Tesei, Teseo – Italian naval officer and pioneering military diver
  • Test of pressure – Diagnostic technique to identify decompression sickness
  • Testing and inspection of diving cylinders – Periodical inspection and testing to revalidate fitness for service
  • Texas Finswimming Association – Official governing body for competitive and recreational finswimming in Texas
  • Thalmann algorithm – Mathematical model for diver decompression
  • Thalmann, Edward D. – American hyperbaric medicine specialist and decompression researcher
  • Tham Luang cave rescue – 2018 international rescue in Thailand
  • The Darkness Beckons – History of UK cave diving by Martyn Farr
  • The Last Dive – Non-fiction book by Bernie Chowdhury about a double wreck diving fatality
  • Thermal undersuit – Insulating undergarments for use with a dry suit
  • Therapeutic decompression tables – Planned hyperbaric exposure profiles to treat decompression sickness
  • Therapeutic recompression – Recompression to reduce symptoms of decompression illness
  • Thermal balance of the diver – Body temperature regulation in the underwater diver
  • Thermocline – Thermal layer in a body of water
  • Thermodynamic decompression model – Early model in which decompression is controlled by volume of gas bubbles forming in tissues
  • Thermodynamic model of decompression – Early model in which decompression is controlled by volume of gas bubbles forming in tissues
  • Theseus (AUV) – Large autonomous underwater vehicle for laying fibre-optic cable
  • The Shaft (sinkhole) – Karst feature in South Australia
  • The Silent World – 1956 French documentary film co-directed by Jacques Cousteau and Louis Malle
  • The Silent World: A Story of Undersea Discovery and Adventure – Book by Jacques-Yves Cousteau and Frédéric Dumas
  • Three bolt equipment – Standard diving dress using three bolts to clamp the helmet bonnet to the corselet
  • Three Star Diver – Fully trained and experienced recreational dive
  • Through-water communications – Wireless diver voice communications equipment
  • Tidal race – Fast-moving tidal flow passing through a constriction, forming waves, eddies and strong currents
  • Tide – Rise and fall of the sea level under astronomical gravitational influences
  • Tillman, Albert – American educator and underwater diver
  • Timeline of diving technology, also known as Timeline of underwater diving technology – Chronological list of notable events in the history of underwater diving equipment
  • Tissue (biology) – Group of similar cells performing a specific function
  • Tissue slab decompression model – A diffusion limited series tissue decompression model
  • Tissue slab diffusion model – Diffusion limited series tissue decompression model
  • Torricellian chamber – Air space in a cave chamber with pressure below atmospheric
  • Total Nitrogen Time – Equivalent pressure exposure estimate for a repetitive dive
  • Touboulic, Pierre-Marie – French engineer, inventor and writer
  • Tourism on the Great Barrier Reef – Service industry in Australia involving recreational diving
  • Towboard – Underwater survey equipment used to tow a diver
  • Transfer under pressure – Moving between pressurised vessels without decompression
  • Travel gas – Gas breathed during the descent part of a dive
  • Tremie – Equipment for underwater concrete placement
  • Trial diving – Introductory scuba diving experience
  • Tribonucleation – Mechanism for creation of microbubbles
  • Trieste II – US Navy's second bathyscaphe
  • Triger, Jacques – French geologist who invented the pressurised caisson (1801–1867)
  • Trim weights (diving) – Diving weights distributed primarily to improve trim
  • Trimix blender – Person competent to blend trimix breathing gases for scuba diving
  • Trimix (breathing gas) – Breathing gas consisting of oxygen, helium and nitrogen
  • Trimix Scuba Association (TSA) – Recreational technical scuba training and certification agency
  • Trongle – Device used on submarines to help swimmers to locate a submerged submarine
  • Tropical coral reef – Reefs built by warm-water coral species
  • Try-dive – Supervised diving experience to try out diving or equipment
  • Turbidity – Cloudiness of a fluid
  • Turkish Underwater Sports Federation (TSSF), also known as Türkiye Sualtı Sporları Federasyonu – Turkish national governing body for underwater sport and lifesaving
  • Twin bladder buoyancy compensator – Scuba diving buoyancy compensator with redundant air bag
  • Twin-hose regulator – Scuba regulator with two ambient pressure hoses to the mouthpiece
  • Type 1 wet bell – Open diving bell without onboard gas panel
  • Type 2 wet bell – Diving bell with onboard gas panel
  • Type 904 dive tender – Chinese class of naval diving support vessel

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See also

Underwater diving at Wikipedia's sister projects
  • Definitions from Wiktionary
  • Media from Commons
  • News from Wikinews
  • Quotations from Wikiquote
  • Texts from Wikisource
  • Textbooks from Wikibooks
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