Index of underwater diving: D–E

The following index is provided as an overview of and topical guide to underwater diving: Links to articles and redirects to sections of articles which provide information on each topic are listed with a short description of the topic. When there is more than one article with information on a topic, the most relevant is usually listed, and it may be cross-linked to further information from the linked page or section.

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 control and safety equipment, and tools for the task at hand.

There are seven sub-indexes, listed here. The tables of content should link between them automatically:

D

Contents: Top	0–9	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z

Section contents: Top of section, Da–Dd, De, Di, Do, Dr, Ds, Du–Dw, Dy

Da–Dd

Dacor (scuba diving) – Former American diving equipment manufacturer
Dalmine (cylinders) – Italian manufacturer of seamless steel gas cylinders
Dalton's law – Empirical law of partial pressures
Damant, Guybon Chesney Castell – English physiologist, diver, royal navy officer, and researcher
DAN Asia-Pacific – Regional organisation of the Divers Alert Network
DAN Brasil – Regional organisation of the Divers Alert Network
DAN Europe – Regional organisation of the Divers Alert Network
DAN Japan – Regional organisation of the Divers Alert Network
DAN Southern Africa – Regional organisation of the Divers Alert Network
DAN World – Organisation of the Divers Alert Network covering other regions
The Darkness Beckons – History of UK cave diving by Martyn Farr
Darwin's Arch – Rock arch near Darwin Island (collapsed 2021)
Davis Submerged Escape Apparatus – Early submarine escape oxygen rebreather also used for shallow water diving.
Davis, Robert – English inventor and manufacturer of underwater breathing apparatus
Day boat (diving), also known as Day dive boat – Diving excursion boat without overnight accommodation
Day, John – First recorded death in a diving chamber
D-BRUV – Downward looking baited remote underwater video
DCIEM decompression tables – Decompression tables based on the Kidd-Stubbs model
DDRC Healthcare – British hyperbaric medical organisation

De

Section contents: Top of section, Da–Dd, De, Di, Do, Dr, Ds, Du–Dw, Dy

Dead space (physiology) – Inhaled air not part of gas exchange
Deadspace (in breathing apparatus) – Inhaled air not part of gas exchange
Deadweight anchor – Anchor that relies on weight and friction for holding
Deane, Charles Anthony – Pioneering diving engineer and inventor of a surface supplied diving helmet
Deane, John – Joint inventor of the diving helmet
Death of Linnea Mills – Death of a recreational scuba diver during training
Decima Flottiglia MAS – Italian naval commando frogman unit of the Fascist era
Deck decompression chamber – Hyperbaric chamber suitable for surface decompression or emergency use at a dive site
Decompression algorithm – Procedure to calculate the decompression needed for a given dive profile
Decompression bar – Horizontal bar suspended below the water surface at a decompression stop
Decompression buoy – Inflatable surface marker buoy deployed from underwater
Decompression ceiling – Theoretic limit to ascent with a decompression obligation
Decompression chamber – Any pressure vessel for human occupancy used to decompress a person
Decompression chamber operation – Operation of a hyperbaric chamber in support of underwater diving
Decompression computer, also known as dive computer – Instrument to calculate decompression status in real time
Decompression cylinder – Scuba cylinder carrying decompression gas
Decompression (diving) – Pressure reduction and its effects during ascent from depth
Decompression equipment – Equipment used by divers to facilitate decompression
Decompression gas – Oxygen-rich gas used for accelerated decompression
Decompression illness – Disorders arising from ambient pressure reduction
Decompression model – Conceptual explanation forf decompression that helps formulate predictions
Decompression modelling – Using conceptual explanation forf decompression to help formulate predictions
Decompression monitoring equipment – Equipment for monitoring depth and run time of a dive, and decompression status
Decompression obligation – Physiological requirement for decompression to reduce risk of injury
Decompression planning – Estimating the decompression for a planned dive profile
Decompression practice – Techniques and procedures for safe decompression of divers
Decompression schedule – A specified ascent rate and series of increasingly shallower decompression stops
Decompression sickness – Disorder caused by dissolved gases forming bubbles in tissues
Decompression status – The theoretical level of inert gas content of the body tissues
Decompression stop – Pause during tascent from a dive to release dissolved inert gas in tissues
Decompression stress – Combined influences on formation of decompression gas bubbles
Decompression theory – Theoretical modelling of decompression physiology
Decompression trapeze – Horizontal bars suspended at decompression stop depths
de Corlieu, Louis – French naval officer and inventor of the swimfin
Deep air diving – Underwater diving beyond accepted limits for breathing air
Deep air diving blackout – Loss of consciousness due to extreme nitrogen narcosis
Deepblu – Manufacturer of dive computers
DeepC – Autonomous underwater vehicle powered by a fuel cell
Deep Diver – Research submersible
Deep diving – Underwater diving to a depth beyond the norm accepted by the associated community
Deep Drone – US Navy remotely operated underwater vehicle
DeepFlight Merlin – 3-seater wet sub diver propulsion vehicle
Deepsea Challenger – Submersible that traveled to the Challenger Deep
Deepspot – Deep swimming pool in Poland
Deep-submergence rescue vehicle – Submersible used for rescue of people from disabled submarines and submersibles
Deep stop – Additional stop deeper than the first obligatory decompression stop
Deep water blackout (disambiguation)
Deep water submersible – Self-propelled deep-diving crewed submersible
Defence Diving School – Diver training centre in Hampshire, UK
Defense against swimmer incursions – Methods of protection from incursions by divers and swimmers
Defence and Civil Institute of Environmental Medicine – Canadian research institute which produced decompression tables
Delta-P (hazard), also known as ΔP, δp – Underwater hazard due to strong localised pressure differential
Delta P Technology – Technical dive computer manufacturer
Demand controlled breathing apparatus – Equipment that supplied breathing gas only when required
Demand helmet – Diving helmet supplied with gas through a demand valve
Demand valve oxygen therapy – Use of high-inhalation concentrations of oxygen as medical treatment
Demister (scuba) – Surfactant used to prevent condensation of water droplets on a mask or helmet viewport
Demobilise (diving) – The dismantling, packing and transport back to storage of the dive spread
Demographics of recreational diving – Population distribution of recreational divers
Demographics of scientific divers – Population distribution of scientific divers
Denayrouze, Auguste – French inventor of a demand air supply regulator for underwater diving
Dental barotrauma – Damage to a tooth caused by a change of ambient pressure
Department of Employment and Labour – Department of the South African government responsible for matters related to employment
Deployment of a decompression buoy – Launching a delayed surface marker buoy
Depth blackout – Loss of consciousness due to deep diving while breathing air
Depth gauge – Instrument that indicates depth below a reference surface
DEPTHX – Autonomous underwater vehicle for exploring sinkholes in Mexico
Descending and ascending (diving) – Procedures for safe ascent and descent in underwater diving
DESCO – American manufacturer of commercial diving equipment
DESCO air hat – Surface -supplied diving free-flow helmet
Developed pressure – Working pressure corrected for actual temperature

Di

Section contents: Top of section, Da–Dd, De, Di, Do, Dr, Ds, Du–Dw, Dy

Diamond Reef System – System for training divers in buoyancy, trim and maneuvering skills
Diffuser (breathing set part) – Component fitted over the exhaust outlet to break up the exhaled gas
Diffusion – Transport of dissolved species from the highest to the lowest concentration region
Diluent flush – Rebreather diving safety procedure
Diluent gas – Metabolically inert gas in a breathing mixture
DIN 477 – German standard for gas cylinder valves
DIN 7876 – German standard for manufacture of swimfins
DIN connection – Scuba cylinder standard valve connection
DIR philosophy – An approach to scuba diving safety
Directed search – Underwater search directed from the surface
Disappearance of Ben McDaniel – Scuba diver who disappeared during or after a cave dive
Distance line, also known as guide line – Line deployed by scuba divers for navigation
Diuresis – Increase in urine production
Dive bag – Container for transporting personal diving equipment
Dive boat – Boat used for the support of scuba diving operations
Dive boat operation – Operational procedures for a boat supporting diving
Dive boat skipper – Person in command of a dive boat
Dive briefing – Meeting of the dive team to discuss details before the diving operation
Dive center – Service organisation providing recreational diver training, equipment and dive outings
Dive computer, also known as Decompression computer – Instrument to calculate decompression status in real time
Dive computer algorithm – Program for calculating decompression status and an acceptably safe ascent profile
Dive computer lockout – Programmed shutdown of decompression information
Dive cylinder – Cylinder to supply breathing gas for divers
Dive guide (disambiguation)
Dive guide (publication) – Travel guides for recreational diving
Dive leader, also known as dive guide – Recreational diving certification and role
Dive Leader – Recreational diving certification
Dive light – Light used underwater by a diver
Dive location – Location at which a dive may occur
Dive log – Record of diving history of an underwater diver
Divemaster – Recreational dive leader certification and role
Dive plan – Product of dive planning activity
Dive planning – The process of planning an underwater diving operation
Dive profile – Diver's pressure exposure over the time of a dive
Dive resort – Recreational diving service provider with accommodation
Dive school – Establishment for diver training
Dive site – Place at which underwater diving occurs
Dive skins – Thin exposure suit to protect the skin in warm water
Divesoft – Manufacturer of diving rebreathers and accessories
Dive spool – Simple flanged cylindrical line-holder
Dive spot – Location at which a dive may occur
Dive suit – Garment or device designed to protect a diver from the underwater environment
Dive supervisor – Professional diving team leader responsible for safety
Dive Supervisor – Recreational dive leadership certification
Dive tables – Data used to determine a decompression schedule for a given dive profile and breathing gas
Dive team – A group of people working together to enhance dive safety and achieve a task
Dive timer – Electronic timer that automatically records the run time of a dive
Dive weights – Ballast weights carried by divers to counteract buoyancy of equipment
Dive-float – Small buoy towed by an underwater diver to indicate presence
Dive supervision – The work of the manager of a professional diving team
Dive/surface valve (DSV) – Valve on a rebreather mouthpiece to isolate the breathing loop when not in use
Diver, The – Sculpture by John Kaufman
Diver (United States Navy) – US Navy personnel qualified in underwater diving and salvage
Diver certification – Certification as competent to dive to a specified standard
Diver certification agency – Organisation which issues certification for competence in diving skills
Diver certification equivalences – Comparison between certifications by different agencies
Diver certification organisation – Organisation that issues certificates of competence to underwater divers
Diver communications – Methods used by underwater divers to communicate
Diver detection sonar – Acoustic location systems to detect divers and submerged swimmer delivery vehicles
Diver down flag – Flag signal indicating divers are in the water nearby
Diver excursion – Diver temporary movement away from a reference point
Diver hand signals – Hand signals used for communication with divers
Diver lift – Movable platform for lifting a diver from the water to deck level
Diver lock-out compartment – Airlock used for underwater access to a submarine
Diver lock-out submersible – Manned submersible with an airlock for underwater use
Diver medical technician – Paramedic with special training in diving medical emergencies
Diver navigation – Underwater navigation by scuba divers
Diver organisations – Membership organisations of underwater divers
Diver propulsion vehicle (DPV) – Powered device for diver mobility and range extension
Diver rescue – Rescue of a distressed or incapacitated diver
Diver safety – Risk management by and for the diver
Diver searches – Underwater searches carried out by divers.
Diver sled – Unpowered steerable creboards towed by a surface boat
Diver surface detection aids – Equipment to make a surfaced diver easier to find
Diver training – Processes to develop the skills and knowledge to dive safely underwater
Diver training manual – Documentary training aid used for training underwater divers
Diver training agency – Organisation for training and certifying underwater divers
Diver training organization – Organization which provides training in diving skills or knowledge
Diver training referral system – System for allowing training to be completed by another instructor
Diver training standard – Document describing requirements of a diver training programme
Diver training tank – Tank of water to practice diving skills
Diver trim – Balance and orientation skills of an underwater diver
Diver voice communications – Protocol for spoken communications in diving operations
Diver voice communication protocol – Procedures for effective communication with divers
Diver weighting system – Ballast carried by underwater divers to counteract buoyancy
Diver's air pump – Manually powered surface air supply for divers
Divers Academy International – Technical educational institution in New Jersey that offers training in commercial diving
Divers Alert Network (DAN) – International group of not-for-profit organizations for improving diving safety
Divers Alert Network America – A not-for-profit diving safety organization based in the US
Divers Alert Network Asia-Pacific – A not-for-profit diving safety organization based in Australia
Divers Alert Network Europe – A not-for-profit diving safety organization based in Europe
Divers Alert Network publications
Divers Alert Network Southern Africa (DAN-SA) – A public benefit diving safety organization based in South Africa
Diver's attendant – Assistant for a diver
Diver's cutting tool – A tool to assist in extricating the diver from entrapment by lines or nets
Diver's harness – Item fastened around a diver which allows the diver to be lifted
Divers Institute of Technology – Private, commercial educational institution for the training of commercial divers
Diver's knife – A tool to assist in extricating the diver from entrapment by lines or nets
Diver's logbook – Record of diving history of an underwater diver
Diversnight – Annual recreational night diving festival.
Diver's pump – Manually powered surface air supply for divers
Diver's safety harness – Harness suitable for lifting a diver out of the water
Diver's telephone – Hard wired diver communications equipment
Diver's tender – Assistant to a diver
Diver's umbilical – Hose supplying breathing gas to a diver from the support platform
Divex – Scottish provider of diving equipment and related services.
Diviac – Online booking site for diving holidays
Diving accident – Accident occurring while diving underwater
Diving accident investigation – Forensic investigation into causes of reportable incidents
Diving activities – Things people do while diving underwater
Diving air compressor, also known as Diving compressor – Machine used to compress breathing air for use by underwater divers
Diving air compressor operator – Person who operates a diving air compressor
Diving air filter – Device to purify compressed breathing air
Diving air pump – Manually powered surface air supply for divers
Diving attendant – Member of a dive team responsible for assisting the diver
Diving at Work Regulations 1997 – UK legislation regulating all aspects of professional diving
Diving basket – Platform for lowering and lifting a diver through the water
Diving bell – Chamber for transporting divers vertically through the water
Diving bell cross-haul system, also known as diving bell cross-hauling system – Cables to move a bell laterally under the water
Diving bell deployment – Deployment of a modern diving bell
Diving boat – Boat used for the support of scuba diving operations
Diving buddy – Diver who dives as one of a buddy pair
Diving certification – Evidence of having been trained to a standard
Diving chamber – Hyperbaric pressure vessel for human occupation used in diving operations
Diving chamber operation – Operation of a hyperbaric chamber in support of underwater diving
Diving compass – Compass intended for diver navigation
Diving contractor – The legal persona responsible for professional diving operations for a client
Diving control board – Group with responsibility for all scientific diving work done by an American organisation
Diving cylinder – Container to supply high pressure breathing gas for divers
Diving destination – Places where recreational divers go on vacation
Diving Diseases Research Centre (DDRC) – British hyperbaric medical organisation
Diving disorders – Physiological disorders resulting from underwater diving
Diving emergency – Situation that endangers the life or health of a diver
Diving environment – Characteristics of the environment in which underwater diving takes place
Diving equipment – Equipment used to facilitate underwater diving
Diving Equipment and Marketing Association (DEMA) – International trade association for the recreational diving equipment industry
Diving equipment maintenance and testing – Ensuring that the equipment is safe to use
Diving equipment technician – Person who maintains, repairs and tests diving and support equipment
Diving fatalities – Deaths associated with underwater diving
Diving flag – Flag signal indicating divers are in the water nearby
Diving gas analysis – Measuring the components in a breathing gas blend
Diving glove – Hand protection worn while driving
Diving half-mask – Mask covering the nose and eyes of an underwater diver
Diving hand signals – A form of sign system used to communicate underwater
Diving harness – Item fastened around a diver which allows the diver to be lifted
Diving hazards – Agents and situations that pose a threat to the underwater diver
Diving heavy – Underwater diving while intentionally negatively buoyant
Diving helmet – Rigid head enclosure for underwater diving
Diving incident and accident investigation – Forensic investigation of underwater diving accidents
Diving in cold water – Diving in water where heat loss is a serious problem
Diving in cool water – Conditions where heat loss is easily managed
Diving in freezing water – Diving in water temperatures near freezing point
Diving in hot water – Diving in conditions where active cooling is necessary
Diving instructor – Person who trains and assesses underwater divers
Diving Instructor – Person who trains and assesses underwater divers
Diving instrument console – Mounting for a group of scuba diving instruments
Diving in warm water – Diving in conditions where no thermal protection is needed
Diving jackstay – Form of guideline laid between two points to guide the diver
Diving jargon – Definitions of jargon, diver slang and acronyms used in underwater diving
Diving ladder – Ladder to facilitate egress from the water by divers
Diving law – Laws directly affecting diving activities
Diving legislation – Legislation directly affecting diving activity
Diving light – Portable light source for use underwater
Diving line signals – Standard signals coded in the form of tugs on the diver's lifeline
Diving locations – Places that divers go to enjoy the underwater environment
Diving logbook – Record of diving history of an underwater diver
Diving mask – Watertight air-filled face cover with view-ports for improving underwater vision
Diving mask clearing – Removing water from a flooded diving mask underwater
Diving Medical Advisory Council (DMAC) – Independent organisation of diving medical specialists from Northern Europe
Diving medical examination – Assessment of medical fitness to dive
Diving medical examiner – A medical practitioner registered to assess medical fitness to dive
Diving Medical Examiner – A medical practitioner registered to assess medical fitness to dive
Diving medical practitioner – Specialist in diagnosis, treatment and prevention of disorders caused by underwater diving
Diving Medical Practitioner – Specialist in diving medicine
Diving medical technician – Person trained in advanced first aid for divers
Diving Medical Technician – Person trained in advanced first aid for divers
Diving medicine – Diagnosis, treatment and prevention of disorders caused by underwater diving
Diving Medicine Physician – Doctor registered as competent to manage diving accidents
Diving mode – The conceptual methods of underwater diving
Diving operation – Underwater dive and support activities to achieve a specific goal
Diving operations record – Documentation recording a professional dive
Diving physics – Aspects of physics which affect the underwater diver
Diving physiology – Influences of the underwater environment on the physiology of human divers
Diving platform (scuba) – Low freeboard platform on a dive boat to give divers easy access to the water
Diving procedures – Standardised methods of doing things that are known to work effectively and acceptably safely
Diving project – The overall diving job by a diving contractor under a specific contract
Diving rebreather – Closed or semi-closed circuit scuba
Diving reflex – The physiological responses to immersion of air-breathing vertebrates
Diving regulations – Stipulations of the delegated legislation regarding the practice of underwater diving
Diving regulator – Mechanism that controls the pressure of a breathing gas supply for diving
Diving regulator malfunction – Failure modes of breathing gas control valves for underwater diving
Diving response – The physiological responses to immersion of air-breathing vertebrates
Diving safety – Risk management of underwater diving activities
Diving safety equipment – Equipment used to facilitate underwater diving safety
Diving safety harness – A harness by which the diver can safely be lifted
Diving safety officer – Administrator of a US university's research diving safety program
Diving school – Establishment for training and assessing underwater divers
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 signal – Signals made by divers for communication
Diving skins – Suit worn to protect the skin from jellyfish stings, abrasion and sunburn
Diving spread – The topside base for commercial diving operations
Diving stage – Platform on which a diver is transported vertically through the water
Diving stage deployment – Launch and recovery of a diving stage
Diving suit – Garment or device designed to protect a diver from the underwater environment
Diving suit hood – Protective headgear worn by underwater diver
Diving superintendent – A management position responsible for diving operations
Diving supervisor – Professional diving team leader responsible for safety
Diving support equipment – Equipment used in the support of an underwater diving operation
Diving support vessel – 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 team – Group of people working together to enhance dive safety and achieve a task
Diving team tools and equipment – Equipmemt shared by the members of a diving team
Diving terminology – Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
Diving terms – Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
Diving theory – The knowledge required for safe diving
Diving tourism – Tourism focused on recreational diving activities
Diving tourism industry – Industry based on recreational diver travel
Diving Unlimited International – American manufacturer of dry suits and other diving equipment
Diving watch – Watch designed for underwater diving
Diving weight – Ballast carried by a diver to counteract buoyancy or adjust trim
Diving weight harness – Diver ballast system supported by straps over the shoulders
Diving weighting system – Ballast carried to counteract buoyancy

Do

Section contents: Top of section, Da–Dd, De, Di, Do, Dr, Ds, Du–Dw, Dy

Doing It Right (scuba diving) (DIR) – Technical diving safety philosophy
Donald Duck effect – Type of speech distortion caused by the breathing gas
Donald, Kenneth William – British expert on underwater and exercise physiology.
Downline (diving) – Rope from the surface to an underwater workplace
Downstream scuba manifold – Component used to functionally connect scuba cylinders
Downstream valve – Valve which is opened along the pressure differential

Dr

Section contents: Top of section, Da–Dd, De, Di, Do, Dr, Ds, Du–Dw, Dy

Dräger (company) – German manufacturer of breathing equipment
Dräger Atlantis – Semi-closed circuit recreational diving rebreather
Dräger DM20 oxygen rebreather system – Oxygen rebreather system for copper helmet
Dräger DM40 mixed gas rebreather system – Nitrox rebreather system for copper helmet
Dräger Dolphin – Semi-closed circuit recreational diving rebreather
Dräger Modell 1915 Bubikopf helmet – Copper helmet for rebreather systems
Dräger Ray – Semi-closed circuit diving rebreather
Draining the rebreather loop – Removing water from the breathing circuit
Drass-Galeazzi – Italian manufacturer of lightweight diving helmets
DRDC Toronto – Major military research station in Canada
Drift diving – Scuba diving where the diver is intentionally transported by the water flow
Drifting surface buoy – Oceanographic instrument package floating at the surface transported by current
Drill Master diving accident – Fatal diving bell accident off Norway in 1974
Drop tank (scuba) – Scuba set placed along the guideline on a cave dive for later use
Drowning – Respiratory impairment caused by submersion in liquid
Dry bell – Hyperbaric chamber for transporting diversvertically through the water
Dry Combat Submersible – Midget submarine project
Dry suit – Watertight clothing that seals the wearer from cold and hazardous liquids
Dry suit blowup – Over-inflation of a dry suit causing uncontrolled ascent
Dry suit diver – Certification for diving in a dry suit
Dry suit inflation cylinder – Diving cylinder dedicated for suit inflation gas
Dry suit inflation hose – Low pressure inflation gas supply
Dry suit inflation valve – Manual valve to admit low pressure gas into a diving dry suit
Dry suit inflator – Equipment to add air inside a diver's dry suit
Dry suit inversion and blowup – Dangerous malfunction or misuse of diving dry suit
Dry suit squeeze – Compression of the dry suit at depth which can pinch the skin and restrict motion

Ds

Section contents: Top of section, Da–Dd, De, Di, Do, Dr, Ds, Du–Dw, Dy

DSRV-2 Avalon – Mystic-class deep-submergence rescue vehicle
DSV-5 Nemo – Submersible used by the United States Navy
DSV Alvin – Crewed deep-ocean research submersible
DSV Bakunawa – Crewed full ocean depth rated submersible
DSV Fendouzhe – Chinese deep submergence vehicle
DSV Limiting Factor – Crewed full ocean depth rated submersible
DSV Sea Cliff – US Navy crewed deep-ocean research submersible
DSV Shinkai – Crewed research submersible
DSV Shinkai 2000 – Japanese crewed research submersible
DSV Shinkai 6500 – Japanese crewed research submersible
DSV Turtle – US Navy crewed deep-ocean research submersible

Du–Dw

Section contents: Top of section, Da–Dd, De, Di, Do, Dr, Ds, Du–Dw, Dy

Dual bladder buoyancy compensator – Scuba diving buoyancy compensator with redundant air bag
Duckbill valve – Type of check valve
Dump valve (diving) – Pressure relief and manual vent on diving buoyancy compensator
Dutch Underwater Sports Association – Dutch governing body for underwater sports
Duty of care – Type of legal obligation
Dwell time (filtration) – Time that fluid spends passing through active filter medium

Dy

Section contents: Top of section, Da–Dd, De, Di, Do, Dr, Ds, Du–Dw, Dy

Dynamic apnea – Freediving disciplines where the diver swims horizontally under water
Dynamic compression of the airways, also known as Dynamic airway compression – Mechanism reducing lung airway section area during forced expiration
Dynamic positioning – Automatic ship station- and heading-holding systems
Dynamically positioned vessel (DPV) – Ship with automatic station- and heading-holding systems
Dynamically Positioned Vessel Owners Association (DPVOA) – Precursor to International Marine Contractors Association
Dysbaric osteonecrosis – Ischemic bone disease caused by decompression bubbles
Dysbarism – Medical conditions resulting from changes in ambient pressure

E

Contents: Top	0–9	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z

Section contents: Top of section, Ea–Ek, El, Em, En–Ep, Eq–Er, Es, Eu–Ev, Ex

Ea–Ek

Ear clearing, also known as ear equalisation – Equalising of pressure in the middle ears
Ebullism – Formation of vapour bubbles in bodily fluids due to reduced environmental pressure
Ecological impact of recreational diving – Effects of scuba diving on the underwater environment
Eelume – Autonomous underwater vehicle being developed by Eelume AS
Effects of drugs on fitness to dive – Known side-effects and contraindications of drugs commonly used by divers
Ekman transport – Net transport of surface water perpendicular to wind direction

El

Section contents: Top of section, Ea–Ek, El, Em, En–Ep, Eq–Er, Es, Eu–Ev, Ex

Electro-galvanic oxygen sensor – Electrochemical device for measuring oxygen partial pressure
Electronically controlled closed circuit rebreather – Underwater breathing apparatus with automatic gas composition control

Em

Section contents: Top of section, Ea–Ek, El, Em, En–Ep, Eq–Er, Es, Eu–Ev, Ex

Emergency air sharing, also known as emergency gas sharing – Supply of breathing air from one scuba diver to another
Emergency ascent – An ascent to the surface by a diver in an emergency
Emergency buoyant ascent – Emergency procedure in underwater diving
Emergency closed bell procedures, also known as closed bell emergency procedures – Standard procedures for use in common surface-supplied closed bell diving emergencies
Emergency ditching of diving weights – Emergency removal of diving weights to increase buoyancy
Emergency gas supply – Alternative independent breathing gas supply carried by a diver
Emergency procedure – Plan of action to deal with an emergency
Emergency Response Diving International (ERDI) – American organisation for training and certification of emergency response divers
Emergency response plan – Action to be taken in specific emergencies
Emergency swimming ascent (ESA) – Emergency procedure used by scuba divers
Emergency wet bell procedures, also known as wet bell emergency procedures – Standard procedures for use in common surface-supplied wet bell diving emergencies

En–Ep

Section contents: Top of section, Ea–Ek, El, Em, En–Ep, Eq–Er, Es, Eu–Ev, Ex

EN 1972:1997 – European standard design and manufacture of snorkels
Engineer diver (disambiguation)
Engineering controls – Hazard controls that are physical changes to the workplace
Engineering redundancy – Duplication of critical components to increase reliability of a system
Entanglement (hazard) – Entrapment by lines or nets
Entry level diver training – Minimum standard for diver trainingu in a given context
Entry level recreational diver training – Minimum standard for entry level recreational scuba diver training
Environmental effects of scuba diving – Effects of recreational scuba diving on the underwater environment
Environmental impact of recreational diving – Effects of scuba diving on the underwater environment
Environmental impact of scuba diving – Effects of recreational scuba diving on the underwater environment
Épaulard – French remotely operated underwater vehicle of the Ifremer

Eq–Er

Section contents: Top of section, Ea–Ek, El, Em, En–Ep, Eq–Er, Es, Eu–Ev, Ex

Equalising the ears – Balancing pressure in the middle ears with ambient pressure
Equivalent air depth – Method of comparing decompression requirements for air and a given nitrox mix
Equivalent narcotic depth – Method for comparing the narcotic effects of a mixed diving gas with air
Ergonomics of diving equipment – Interaction between diving equipment and the diver

Es

Section contents: Top of section, Ea–Ek, El, Em, En–Ep, Eq–Er, Es, Eu–Ev, Ex

Escape breathing apparatus – Self contained breathing apparatus providing gas to escape from a hazardous environment
Escape trunk – Ambient pressure escape system for submarines

Eu–Ev

Section contents: Top of section, Ea–Ek, El, Em, En–Ep, Eq–Er, Es, Eu–Ev, Ex

EUF Certification International – Independent body for global verification of rebreather training agencies
Eurocylinder Systems AG, also known as Eurocylinder – German manufacturer of seamless steel pressure cylinders for gas
European Diving Technology Committee (EDTC) – International organisation for improving professional diver safety
European Scientific Diver – A diver competent to perform as a member of a scientific diving team.
European Scientific Diving Panel – A panel of the European Network of Marine Research Institutes and Stations
European Underwater and Baromedical Society (EUBS) – Source of information for diving and hyperbaric medicine
European Underwater Federation (EUF) – Umbrella organisation representing scuba diver training organisations in Europe
Evacuation plan – Plan for removal of personnel from a high risk area or a developing incident to a safer place

Ex

Section contents: Top of section, Ea–Ek, El, Em, En–Ep, Eq–Er, Es, Eu–Ev, Ex

Excursion from storage depth – Change of depth from the nominal depth in the saturation habitat
Excursion umbilical – A diver's umbilical supplied from a bell gas panel
Exercise Paddington Diamond – Joint Bolivian-British-Swiss scuba diving expedition to Lake Titicaca
Expanding square search – Search pattern expanding stepwise outward from datum
Explorer AUV – Autonomous underwater vehicle from People's Republic of China
Exponential–Linear model – Decompression model based on exponential gas uptake and linear elimination
Explosive ordnance disposal (United States Navy) – US Navy personnel who render safe or detonate unexploded ordnance
Exposure assessment – Measuring toxic or environment exposure
Extended range surface-supplied air diver – Surface-supplied offshore air diving to 50 msw using a wet bell and hot water suit
External dead space – Space in breating apparatus in which the breathing gas flows in both directions

Contents: Top	0–9	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z

Index of underwater diving: D–E

D

Da–Dd

De

Di

Do

Dr

Ds

Du–Dw

Dy

E

Ea–Ek

El

Em

En–Ep

Eq–Er

Es

Eu–Ev

Ex

See also