Index of underwater diving

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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.

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  • Dalton's law – Gas law describing pressure contributions of component gases in a mixture
  • The Darkness Beckons – A history of UK cave diving by Martyn Farr
  • Davis Submerged Escape Apparatus – Early submarine escape oxygen rebreather also used for shallow water diving.
  • Dead space (physiology) – The volume of inhaled air that does not take part in the gas exchange
  • Decima Flottiglia MAS – Italian naval commando frogman unit of the Fascist era
  • Decompression buoy – Inflatable surface marker buoy deployed from underwater
  • Decompression (diving) – The reduction of ambient pressure on underwater divers after hyperbaric exposure and the elimination of dissolved gases from the diver's tissues
  • Decompression equipment – Equipment used by divers to facilitate decompression
  • Decompression illness – Disorders arising from ambient pressure reduction
  • Decompression practice – Techniques and procedures for safe decompression of divers
  • Decompression sickness – Disorder caused by dissolved gases in the tissues forming bubbles during reduction of the surrounding pressure
  • Decompression theory – Theoretical modelling of decompression physiology
  • Decompression trapeze – Horizontal bars suspended at decompression stop depths
  • DeepC – Autonomous underwater vehicle powered by a fuel cell
  • Deep diving – Underwater diving to a depth beyond the norm accepted by the associated community
  • Diamond Reef System – System for training divers in buoyancy, trim and maneuvering skills
  • DEPTHX – Autonomous underwater vehicle for exploring sinkholes in Mexico
  • Diffusion – Statistical movement of molecules or atoms from a region of high concentration to a region of low concentration
  • Distance line/dive reel/guide line – Line deployed by scuba divers for navigation
  • Dive boat – Boat used for the support of scuba diving operations
  • Dive computer, also known as Decompression computer – Instrument to record dive profile and calculate decompression obligations in real time
  • Dive guide – A recreational dive leader certification and role
  • Dive light – Light used underwater by a diver
  • Dive log – Record of diving history of an underwater diver
  • Divemaster – Recreational dive leader certification and role
  • Dive planning – The process of planning an underwater diving operation
  • Dive team – A group of people working together to enhance dive safety and achieve a task
  • Diver certification – Certification as competent to dive to a specified standard
  • Diver communications – Methods used by underwater divers to communicate
  • Diver down flag – Flag signal indicating divers are in the water nearby
  • Diver navigation – Underwater navigation by scuba divers
  • Diver propulsion vehicle (DPV | Diver propulsion vehicle]] (DPV]]
  • Diver rescue – Rescue of a distressed or incapacitated diver
  • Diver training – Processes by which people develop the skills and knowledge to dive safely underwater
  • Diver trim – Balance and orientation skills of an underwater diver
  • Divers Alert Network (DAN) – International group of not-for-profit organizations for improving diving safety
  • Diver's attendant – The member of a dive team who assists the diver at the surface and tends the diver's umbilical or lifeline
  • Divers Institute of Technology – A private, commercial educational institution for the training of commercial divers
  • Diver's pump – Manually powered surface air supply for divers
  • Diver's umbilical – A hose and cable bundle which supplies breathing gas, communications and other services to a diver
  • Diving air compressor, also known as Diving compressor – Machine used to compress breathing air for use by underwater divers
  • Diving bell – Chamber for transporting divers vertically through the water
  • Diving chamber – Hyperbaric pressure vessel for human occupation used in diving operations
  • Diving cylinder – High pressure compressed gas cylinder used to store and supply breathing gas for diving
  • Diving Diseases Research Centre (DDRC) – British hyperbaric medical organisation
  • Diving disorders – Physiological disorders resulting from underwater diving
  • Diving equipment – Equipment used to facilitate underwater diving
  • Diving Equipment and Marketing Association (DEMA) – International trade association for the recreational diving equipment industry
  • Diving hazards – The hazards to which an underwater diver may be exposed
  • Diving helmet – Rigid head enclosure with breathing gas supply worn for underwater diving
  • Diving instructor – Person who trains and assesses underwater divers
  • Diving mask – Watertight air-filled face cover with view-ports for improving underwater vision
  • Diving Medical Advisory Council (DMAC) – Independent organisation of diving medical specialists from Northern Europe
  • Diving medical examiner – A medical practitioner registered to assess medical fitness to dive
  • Diving medical practitioner – A medical practitioner with registered to assess medical fitness to dive, manage diving accidents, plan safety for professional diving operations, provide advanced life support, acute trauma care and general wound care.
  • Diving medical technician – a member of a dive team who is trained in advanced first aid and fit to provide treatment in a hyperbaric chamber in an emergency
  • Diving medicine – Diagnosis, treatment and prevention of disorders caused by underwater diving
  • Diving physics – Aspects of physics which affect the underwater diver
  • Diving reflex – The physiological responses to immersion of air-breathing vertebrates
  • Diving regulator – Mechanism that reduces pressure of a gas supply and provides it to the diver at ambient pressure
  • Diving safety – Safety of underwater diving activities
  • Diving Science and Technology (DSAT) – PADI affiliate and developer of recreational decompression planning tools
  • Diving shot, also known as Shot line – Substantial weighted near-vertical line with buoy
  • Diving stage – A platform on which one or two divers stand which transports them vertically through the water
  • Diving suit – Garment or device designed to protect a diver from the underwater environment
  • Diving supervisor – Professional diving team leader responsible for safety
  • Diving support vessel – A ship used as a floating base for professional diving projects
  • Diving systems technician – A competent person who maintains and repairs diving life-support equipment
  • Diving weight – Ballast carried by a diver to counteract buoyancy or adjust trim
  • Diving weighting system – Ballast carried by underwater divers to counteract buoyancy
  • Doing It Right (scuba diving) (DIR) – Technical diving safety philosophy
  • Dräger Dolphin – Semi-closed circuit recreational diving rebreather
  • Dräger Ray – Semi-closed circuit recreational diving rebreather designed to use standard nitrox breathing gas mixtures
  • Drift diving – Scuba diving where the diver is intentionally transported by the water flow
  • Drill Master diving accident – Fatal diving bell accident off Norway in 1974
  • Drowning – Respiratory impairment resulting from being in or under a liquid
  • Dry suit – Watertight clothing that seals the wearer from cold and hazardous liquids
  • Duty of care – A legal obligation to provide a standard of reasonable care when performing an activity that could foreseeably harm others
  • Dynamic apnea – Freediving disciplines where the breath-hold diver swims horizontally under water with or without fins
  • Dysbaric osteonecrosis – Ischemic bone disease caused by decompression bubbles
  • Dysbarism – Medical conditions resulting from changes of ambient pressure.

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  • 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 exchange – The process by which gases diffuse through a biological membrane
  • Gay-Lussac's law – Any one of several discoveries about thermal expansion of gases and the relationship betweenre
  • Global Underwater Explorers (GUE) – Recreational/technical scuba training and certification agency
  • Goldfinder – Autobiography of British diver and treasure hunter Keith Jessop
  • 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
  • GRUMEC, also known as Brazilian commando frogmen – Brazilian Navy special forces diving unit
  • Gyrojet – Firearm that fires small rocket projectiles

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  • Occupational diving, also known as Professional diving – Underwater diving where divers are paid for their work
  • 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
  • Open Water Diver – An entry-level autonomous diver certification for recreational scuba diving
  • Open-water diving – Diving in unrestricted water and in water when the diver has unrestricted vertical access to the surface
  • Operation Algeciras – Failed Argentine plan to sabotage a British warship in Gibraltar during the Falklands War
  • Operation Thunderhead – American amphibious mission during the Vietnam War
  • Operations manual – authoritative document of how things should be done in an organisation
  • Oxygen compatibility – Use of equipment and materials that are suitable for service with a high partial pressure of oxygen
  • Oxygen therapy – Use of high inhalation concentrations of oxygen as medical treatment
  • Oxygen toxicity – Toxic effects of breathing in oxygen at high concentrations
  • Oxygen window in diving decompression – Physiological effect of oxygen metabolism on the total dissolved gas concentration in venous blood

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  • Taifib – Indonesian amphibious reconnaissance unit
  • Taravana – Decompression sickness after breath-hold diving
  • Task loading – The relationship between operator capacity and the accumulated activities than must be done
  • 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
  • Testing and inspection of diving cylinders – Periodical inspection and testing to revalidate fitness for service
  • Thalmann algorithm – Recent US Navy algorithm for modelling of inert gases entering and leaving body tissues as pressure changes
  • Thalmann, Edward D. – American hyperbaric medicine specialist and decompression researcher
  • Therapeutic recompression – Recompression to reduce symptoms of decompression illness
  • Thermocline – A distinct layer in a large body of fluid in which temperature changes more rapidly with depth than it does in the layers above or below
  • Thermodynamic model of decompression – Early model in which decompression is controlled by the volume of gas bubbles coming out of solution
  • Theseus (AUV) – Large autonomous underwater vehicle for laying fibre optic cable
  • Tianjin University Petrel HUG
  • Tidal race – A fast-moving tidal flow passing through a constriction, forming waves, eddies and strong currents
  • Tide – The periodic change of sea levels caused by the gravitational and inertial effects of the Moon, the Sun and the rotation of the Earth
  • Timeline of diving technology – A chronological list of notable events in the history of underwater diving
  • Tissue (biology) – An ensemble of similar cells and their matrix with similar origin and function
  • Torricellian chamber – An air space in a cave chamber with pressure below atmospheric
  • Towboard – Underwater survey equipment used to tow a diver
  • Tremie – Equipment for underwater concrete placement
  • Triger, Jacques – French geologist who invented the 'Triger process' for digging through waterlogged ground
  • 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
  • Turbidity – The cloudiness of a fluid caused by large numbers of particles that are generally invisible to the naked eye
  • Türkiye Sualtı Sporları Federasyonu (TSSF) – Turkish national governing body for underwater sport and lifesaving

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  • Variable weight apnea – Worldwide rule- and record-keeping body for competitive breath-hold events
  • Varying Permeability Model – Decompression model and algorithm based on bubble physics
  • Venture One diving accident – Saturation diving fatality in the North Sea in 1977
  • Vertigo – Type of dizziness where a person feels as if they or the objects around them are moving
  • Vintage scuba – Early model scuba equipment and the ongoing activity of diving with it
  • Viper – Electronically-controlled closed circuit mixed gas military rebreather

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