Index of underwater diving

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

Surface-supplied divers riding a stage to the underwater workplace
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

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

A

B

C
  • Canadian Armed Forces Divers – Underwater divers employed by any of the Canadian armed forces
  • Canoe and kayak diving – Recreational diving from a canoe or kayak
  • Carbon dioxide retention – A tendency to retain abnormally high tissue carbon dioxide levels
  • Carbon dioxide scrubber – Device which absorbs carbon dioxide from circulated gas
  • Carbon monoxide poisoning – Toxic effects of carbon monoxide
  • Carleton CDBA – Military rebreather by Cobham plc
  • Cascade filling system – Filling pressurised gas from a series of storage cylinders
  • Cave Divers Association of Australia (CDAA) – Association to represent cave divers and administrate and support cave diving in Australia
  • Cave diving – Underwater diving in water-filled caves
  • Cave Diving Group (CDG) – UK based cave diver training and certification agency
  • Cenote – A natural pit, or sinkhole, that exposes groundwater underneath
  • HMS Challenger K07 – Royal Navy saturation diving support vessel
  • Chamber operator – A person who operates a diving chamber
  • Charles's law – Relationship between volume and temperature of a gas at constant pressure
  • Checklist – An aide-memoire to ensure consistency and completeness in carrying out a task
  • Christ of the Abyss – A submerged bronze statue of Jesus Christ in the Mediterranean Sea
  • Circulatory system – Organ system for circulating blood in animals
  • Cis-Lunar – Manufacturer of electronically controlled closed-circuit rebreathers for scuba diving
  • Civil liability in recreational diving – Legal duty of care, negligence and liability in recreational diving
  • Clarke, John R. – American scientist and underwater breathing apparatus authority
  • Clearance diver – Navy diver specialist with explosives
  • Clearance Divers Life Support Equipment (CDLSE) – British military electronically controlled closed circuit rebreather
  • Clearance Diving Branch (RAN) – Diving unit of the Royal Australian Navy
  • CMAS* scuba diver – Entry level recreational diving certification from CMAS
  • CMAS Europe – Non-profit branch of the world underwater federation representing European affiliates
  • CMAS Scientific Committee – International organisation for underwater activities in sport and science, and recreational diver training and certification
  • Code of practice – A set of written rules which specifies how people working in a particular occupation should behave
  • Cold shock response – Physiological response to sudden exposure to cold
  • Comando Raggruppamento Subacquei e Incursori Teseo Tesei – Italian special forces diving unit
  • Combat Rubber Raiding Craft – Rubberised fabric tactical inflatable boat used by the US Navy
  • Combat sidestroke – Variation of side-stroke swimming used by United States Navy SEALs
  • Combined gas law – Combination of Charles', Boyle's and Gay-Lussac's gas laws
  • Comhairle Fo-Thuinn (CFT) – governing body for recreational diving and underwater hockey in Ireland
  • Commandos Marine – Special operations forces of the French Navy
  • Commercial diver training – Processes by which people develop the skills and knowledge to dive safely for industrial applications
  • Commercial diving – Professional diving on industrial projects
  • Commercial offshore diving – Professional diving in support of the oil and gas industry
  • Competitive apnea – Competitive breathhold diving
  • Compression arthralgia – Joint pain caused by fast compression to high ambient pressure
  • Confédération Mondiale des Activités Subaquatiques (CMAS) – International organisation for underwater activities in sport and science, and recreational diver training and certification
  • Constant weight apnea – Freediving discipline in which the diver descends and ascends only by swimming with the use of fins
  • Constant weight without fins – Freediving discipline in which the diver descends and ascends only by swimming without the use of fins
  • Controlled buoyant lift – A technique used by scuba divers to raise an incapacitated diver to the surface
  • Controlled emergency swimming ascent – A technique used by scuba divers to return to the surface in an out-of-gas emergency in shallow water
  • Cosmos CE2F series – Italian swimmer delivery vehicles
  • Counterlung – Variable volume component in a rebreather to take up and release gas during a breathing cycle
  • Cryogenic rebreather – Rebreather that removes CO2 by freezing it out using heat exchange with liquid oxygen
  • CUMA – Canadian military diving rebreather
  • Current (stream) – Flow of water in a river due to gravity

D
  • 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 – Net movement of molecules or atoms from a region of high concentration (or high chemical potential) to a region of low concentration (or low chemical potential)
  • 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 leader – International minimum standard for a person professionally leading a group of certified recreational divers
  • 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 agents and situations that pose a threat to the underwater diver
  • 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 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 controls the pressure of a breathing gas supply for diving
  • 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.

E

F

G
  • 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 – Relationship between pressure and temperature of a gas at constant volume.
  • 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

H

I

J
  • 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

K

L

M
  • Marine Commandos – Special operations group of the Lebanese Navy
  • Master diver (United States Navy) – Senior diver rating in US Navy
  • Master Instructor – A certificate given in recognition of a minimum level of experience in training divers after certification as a Diving Instructor, issued by PADI and SSI
  • Master Scuba Diver – The highest non-leadership recreational scuba diver certification issued by some agencies
  • Maximum operating depth – Depth of seawater at which a specified breathing gas mixture will have a limiting maximum oxygen partial pressure
  • Maya AUV India – Autonomous underwater vehicle from National Institute of Oceanography, India
  • Media diving – Underwater diving in support of the media industries
  • Medical fitness to dive – The medical fitness of a person to function safely underwater under pressure
  • Membrane gas separation – Technology for splitting specific gases out of mixtures
  • Metabolism – The set of life-sustaining chemical transformations within the cells of organisms
  • Metre sea water – Unit of pressure equal to one tenth of a bar
  • Military diving – Underwater diving in a military context by members of an armed force
  • Minedykkerkommandoen – Norwegian Navy clearance diver unit
  • Minentaucher – Mine clearance divers of the German Navy
  • Mitchell, Simon – New Zealand physician and author on diving medicine
  • Mk 1 Underwater Defense Gun – Underwater firearm developed by the United States during the Cold War
  • Molecular diffusion – The thermal motion of liquid or gas particles at temperatures above absolute zero
  • Momsen, Charles – American pioneer in submarine rescue for the United States Navy
  • Monofin – Single blade swimfin attached to both feet
  • Moon pool – An opening in the base of a hull, platform, or chamber giving access to the water below
  • Motorised Submersible Canoe – WWII British frogman delivery vehicle
  • Muck diving – Recreational diving on a loose sedimentary bottom

N

O
  • 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 when the diver has unrestricted vertical access to the surface
  • Operation Algeciras – Argentine plan to sabotage a British warship in Gibraltar
  • Operation Thunderhead – American amphibious mission during the civil 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 oxygen as a 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

P
  • Partial pressure – Pressure attributed to a component gas in a mixture
  • PASKAL – Special operations force of the Royal Malaysian Navy
  • Patent foramen ovale – A congenital heart defect in which blood can flow through an opening between the atrial chambers of the heart
  • Pearl hunting – Collecting pearls from wild molluscs
  • Penetration diving – Diving under a physical barrier to a direct vertical ascent to the surface
  • Performance Freediving International (PI) – Freediver training agency
  • Perfusion – Passage of fluid through the circulatory or lymphatic system to an organ or tissue
  • Permeation – The penetration of a liquid, gas, or vapor through a solid
  • Permit To Work
  • Petrel HUG – A Chinese hybrid underwater glider
  • Physiological response to water immersion, also known as Diving reflex – The physiological responses to immersion of air-breathing vertebrates
  • Physiology of decompression – The physiological basis for decompression theory and practice
  • Pillar valve represented by Scuba cylinder valve – Valve controlling flow of breathing gas into and out of a scuba cylinder
  • Polespear – Basic rubber launched underwater fishing spear
  • Police diving – A branch of professional diving carried out by police services
  • Pony bottle – Small independent scuba cylinder usually carried for emergency gas supply
  • Porpoise – Australian scuba manufacturer
  • Powerhead – Specialized firearm used underwater that is fired when in direct contact with the target
  • Pressure – Force distributed continuously over an area
  • Pressure swing adsorption – method of gas concentration using selective adsorbtion under pressure
  • Psychrometric constant – Relation of the partial pressure of water in air to temperature
  • Professional Association of Diving Instructors (PADI) – Recreational diver training and certification agency
  • Professional diving, also known as Occupational diving – Underwater diving where divers are paid for their work
  • Professional Diving Instructors Corporation (PDIC) – Recreational diver training and certification agency
  • Public safety diving – Underwater work done by law enforcement, rescue and search and recovery teams
  • Pulmonary barotrauma – Lung over-pressure and squeeze injuries
  • Pulmonary circulation – The part of the circulatory system which carries blood from heart to lungs and back to the heart
  • Pyle stop – A series of short deep decompression stops in addition to the standard profile


R

S
  • Safety culture – The attitude, beliefs, perceptions and values that employees share in relation to risks in the workplace
  • Safety data sheet, also known as Material safety data sheet – System for cataloging information, potential hazards and instructions for safe use associated with a material or product
  • Salvage diving – The diving work associated with the recovery of vehicles, cargo and structures
  • Saturation diving – Diving for periods long enough to bring all tissues into equilibrium with the partial pressures of the inert components of the breathing gas
  • Save Ontario Shipwrecks (SOS) – A provincial heritage NGO in Ontario, Canada
  • Scientific diving – The use of diving techniques in the pursuit of scientific knowledge
  • Scottish Sub Aqua Club (ScotSAC) – Scottish recreational diver training and certification agency
  • Scuba cylinder valve – Valve controlling flow of breathing gas into and out of a scuba cylinder
  • Scuba diving – Swimming underwater breathing gas carried by the diver
  • Scuba diving fatalities – Deaths occurring while scuba diving or as a consequence of scuba diving.
  • Scuba Diving International (SDI) – Recreational diver training and certification agency
  • Scuba diving tourism – Industry based on recreational diver travel
  • Scuba Educators International (SEI) – Recreational diver training and certification agency
  • Scuba gas planning – Estimation of breathing gas mixtures and quantities required for a planned dive profile
  • Scuba manifold – Scuba component used to connect two diving cylinders
  • Scuba Schools International (SSI) – Recreational scuba and freediving training and certification agency
  • Scuba set – Self contained underwater breathing apparatus
  • Scuba skills – The skills required to dive safely using self-contained underwater breathing apparatus
  • Sea Research Society – American non-profit educational society
  • Sea Trek (diving system) – Recreational underwater diving system using helmets
  • SEAL Delivery Vehicle (SDV) – Manned wet submersible for deploying Navy SEALS
  • Seasickness, also known as Motion sickness – Nausea caused by motion
  • Sentry (AUV) – Autonomous underwater vehicle made by Woods Hole Oceanographic institution
  • Shadow Divers – Book by Robert Kurson recounting the discovery of a World War II German U-boat wreck
  • Shallow Water Combat Submersible – A manned submersible and a type of swimmer delivery vehicle
  • Shark tourism – Tourism industry based on viewing sharks in their natural habitat
  • Shayetet 13 – Special operations unit of the Israeli Navy
  • Shilling, Charles Wesley – US Navy physician and decompression and hyperbaric medicine researcher
  • Ships husbandry diving – Diving related to the maintenance and upkeep of ships
  • Sidemount diving – Diving using an equipment configuration where the scuba sets are clipped to the sides of the harness
  • Siebe Gorman CDBA – A type of diving rebreather used by the Royal Navy
  • Silt out – Reduction of underwater visibility by disturbing silt deposits
  • The Silent World: A Story of Undersea Discovery and Adventure – Book by Jacques-Yves Cousteau and Frédéric Dumas
  • Siluro San Bartolomeo – Italian manned torpedo design of late WWII
  • Single point of failure – A part of a system that, if it fails, will stop the entire system from working
  • Sinking of the Rainbow Warrior – Covert attack by French military frogmen on a civilian ship in peacetime
  • Siva – Military diving rebreather
  • Skandalopetra diving – Freediving using a stone weight at the end of a rope to the surface
  • Snell's law, also known as Law of refraction – The relation between the angles of incidence and refraction of waves crossing the interface between isotropic media
  • Snoopy loop – Short circular elastic length of rubber and latex, commonly used to hold objects together
  • Snorkel – Short, curved tube for breathing face down at the surface of the water
  • Snuba – Limited depth airline breathing apparatus towed by the diver
  • Solo diving – Recreational diving without a dive buddy
  • Solubility – Capacity of a substance to dissolve in a solvent in a homogeneous way
  • Solution – A homogeneous mixture which assumes the phase of the solvent
  • South African Department of Employment and Labour – Department of the South African government responsible for matters related to employment
  • South African Environmental Observation Network (SAEON) – A network of people, organisations and observation platforms, that perform Long-Term Ecological Research in South Africa and surrounding waters
  • South African Underwater Sports Federation (SAUSF) – The official World Underwater Federation representative body in the Republic of South Africa.
  • South Pacific Underwater Medicine Society (SPUMS) – A publisher for diving and hyperbaric medicine and physiology
  • Southern African Underwater and Hyperbaric Medical Association (SAUHMA) – A special interest group of the Council of the South African Medical Association
  • Spearfishing – Hunting for fish using a spear
  • Speargun – Underwater fishing implement
  • Special Boat Service – Special forces unit of the Royal Navy. Formed originally from the RMBPD
  • Special Duties Unit – Hong Kong Police tactical unit
  • Special Service Group (Navy) – Pakistan Navy special operations force
  • Spindle (vehicle) – Ice penetrating two-stage autonomous underwater vehicle
  • SPURV – Self propelled underwater research vehicle built in 1957 for the US Navy
  • SPURV II – Special purpose underwater research vessel built to srudy submarine wakes
  • Sponge diving – Diving to gather natural sponges
  • Sport diving (sport) – Underwater sport using recreational open circuit scuba equipment in a swimming pool
  • SPP-1 underwater pistol – Soviet four-barreled underwater dart pistol
  • Standard diving dress – Rubberised canvas diving suit with copper helmet and weighted boots
  • Standard operating procedure – A set of detailed instructions compiled by an organization Or a manager to help workers carry out operations safely and effectively
  • Stand-by diver – A member of a dive team who is ready to assist or rescue the working diver
  • Star Canopus diving accident – Fatal offshore diving bell accident in 1978
  • Static apnea – A discipline in which the diver holds their breath underwater for as long as possible, and does not need to swim any distance
  • Stratification – Stable water layers of different properties that act as a barrier to vertical mixing
  • Sub-Aqua Association (SAA) – British recreational diver training and certification organisation
  • Subsurface (software) – Open source dive log program
  • Supersaturation – State of a solution that contains more solute than can be dissolved at equilibrium
  • Supervised diver – Minimum requirements for a recreational diver to dive in open water under direct supervision
  • Surface marker buoy – A buoy towed by a scuba diver to indicate the diver's position
  • Surface-supplied diving – Underwater diving breathing gas supplied from the surface
  • Surface-supplied diving equipment – Equipment used specifically for surface supplied diving
  • Surface-supplied diving skills – Skills and procedures required for the safe operation and use of surface-supplied diving equipment
  • Surface tension – Tendency of a liquid surface to shrink to reduce surface area
  • Surfactant – Substance that lowers the surface tension between a liquid and another material
  • Surfer's ear – The common name for an abnormal bone growth within the external ear canal
  • Surge (wave action) – The component of wave motion close to and parallel with the bottom
  • Sustained load cracking – Metallurgical failure mode of cracking under a prolonged static load
  • Swimfin – Finlike accessories worn on the feet, used for swimming, snorkeling and diving propulsion
  • Systemic circulation – The portion of the cardiovascular system which transports oxygenated blood away from the heart (between heart and body cells)

T
  • Taifib – Indonesian amphibious reconnaissance unit
  • Taravana – Decompression sickness after breath-hold diving
  • Task loading – The relationship between operator capacity and the accumulated activities that 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
  • Tidal race – A 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
  • Timeline of diving technology – A chronological list of notable events in the history of underwater diving
  • Tissue (biology) – Cellular organization level
  • 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 pressurised caisson
  • 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

U

V
  • Variable weight apnea – Deep freediving using a weighted sled for descent, pulling along the depth rope for ascent
  • 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 has the sensation of moving or surrounding objects moving
  • Vintage scuba – Early model scuba equipment and the ongoing activity of diving with it
  • Viper – Electronically-controlled closed circuit mixed gas military rebreather
  • Voyage to the Edge of the World – 1976 French nature documentary

W


Y


See also

References
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