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Scuba diving

Index Scuba diving

Scuba diving is a mode of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba) which is completely independent of surface supply, to breathe underwater. [1]

165 relations: Abalone, Air embolism, Air Liquide, American Academy of Underwater Sciences, Aqua-Lung, Aquarium, Artificial gills (human), Ascending and descending (diving), Auguste Denayrouze, Australian Diver Accreditation Scheme, Émile Gagnan, Bailout bottle, Bar (unit), Barotrauma, Benoît Rouquayrol, Birmingham, Bomb disposal, Breathing gas, British Sub-Aqua Club, Buddy breathing, Buddy check, Buddy diving, Buoyancy, Buoyancy compensator (diving), Carbon dioxide, Cave diving, Christian J. Lambertsen, Compass, Compressed air, Confédération Mondiale des Activités Subaquatiques, Coral reef, Cornea, Decompression (diving), Decompression practice, Decompression sickness, Deep diving, Depth gauge, Displacement (fluid), Distance line, Dive center, Dive computer, Dive planning, Dive profile, Divemaster, Diver certification, Diver communications, Diver propulsion vehicle, Diver rescue, Diver trim, Divers Alert Network, ..., Diving cylinder, Diving helmet, Diving mask, Diving physics, Diving regulator, Diving suit, Diving supervisor, Diving weighting system, Drägerwerk, Dry suit, Duke University Hospital, Ear clearing, Emergency ascent, Emergency locator beacon, Emergency management, European Underwater Federation, Far-sightedness, Fire department, Fitness to dive, Flare, Freediving, Frogman, Full face diving mask, Global Underwater Explorers, Guinness World Records, Health and Safety Executive, Heliox, Helium, Henry Fleuss, High-pressure nervous syndrome, Human error, Human torpedo, Hydrology, Hypothermia, Ice diving, Insurance, International Diving Regulators and Certifiers Forum, International Diving Schools Association, International Organization for Standardization, Jacques Cousteau, Jarrod Jablonski, Jogging, John Morgan Wells, Johnson Outdoors, Lens (anatomy), Lifeguard, List of diver certification organizations, List of diving hazards and precautions, Lobster, Major (United States), Major trauma, Marine biology, Maximum operating depth, Melbourne, National Association of Underwater Instructors, National Exhibition Centre, Naval Submarine Medical Research Laboratory, Near-sightedness, Neoprene, Nitrogen, Nitrogen narcosis, Nitrox, NPR, Oceanography, Office of Strategic Services, Oxygen toxicity, Personal flotation device, Piloting (navigation), Police diving, Porpoise (scuba gear), Professional Association of Diving Instructors, Professional diving, Psychological stress, Rebreather, Rebreather diving, Recreational diving, Refractive error, Refractive index, Risk assessment, Risk management, Royal Australian Navy School of Underwater Medicine, Scallop, Scripps Institution of Oceanography, Scuba Diving International, Scuba gas planning, Scuba set, Scuba skills, Sea Hunt, Self-contained breathing apparatus, Ships husbandry, Siebe Gorman, Sign (mathematics), Snorkeling, South Pacific Underwater Medicine Society, Spiny lobster, Surface-supplied diving, Swimfin, Technical diving, The Silent World, Thermal insulation, Trimix (breathing gas), Unconsciousness, Underwater, Underwater archaeology, Underwater diving, Underwater photography, Underwater videography, Underwater vision, United States Navy, Wakulla Springs, Wetsuit, World Recreational Scuba Training Council, World War II, Wreck diving, Yves Le Prieur. Expand index (115 more) »


Abalone (or; via Spanish abulón, from Rumsen aulón) is a common name for any of a group of small to very large sea snails, marine gastropod molluscs in the family Haliotidae.

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Air embolism

An air embolism, also known as a gas embolism, is a blood vessel blockage caused by one or more bubbles of air or other gas in the circulatory system.

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Air Liquide

Air Liquide S.A. (literally "liquid air"), is a French multinational company which supplies industrial gases and services to various industries including medical, chemical and electronic manufacturers.

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American Academy of Underwater Sciences

The American Academy of Underwater Sciences (AAUS) is a group of Scientific organizations and individual members who conduct scientific and educational activities underwater.

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Aqua-Lung was the first open-circuit, self-contained underwater breathing apparatus (or "SCUBA") to reach worldwide popularity and commercial success.

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An aquarium (plural: aquariums or aquaria) is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed.

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Artificial gills (human)

Artificial gills are unproven conceptualised devices to allow a human to be able to take in oxygen from surrounding water.

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Ascending and descending (diving)

In underwater diving, ascending and descending is done using strict protocols to avoid problems caused by the changes in ambient pressure and the hazards of obstacles near the surface or collision with vessels.

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Auguste Denayrouze

August Denayrouze (1837-1883) was one of the inventors of the diving suit, along with Benoît Rouquayrol.

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Australian Diver Accreditation Scheme

The Australian Diver Accreditation Scheme (ADAS) is an international commercial and occupational diver certification scheme.

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Émile Gagnan

Émile Gagnan (November 1900 – 1979) was a French engineer and, in 1943, co-inventor with French Navy diver Jacques-Yves Cousteau of the Aqua-Lung, the diving regulator (a.k.a. demand-valve) used for the first Scuba equipment.

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Bailout bottle

A bailout bottle (BoB) or bailout cylinder is a scuba cylinder carried by an underwater diver for use as an emergency supply of breathing gas in the event of a primary gas supply failure.

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Bar (unit)

The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI).

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Barotrauma is physical damage to body tissues caused by a difference in pressure between a gas space inside, or in contact with the body, and the surrounding gas or fluid.

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Benoît Rouquayrol

Benoît Rouquayrol (1826–1875) was a French inventor.

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Birmingham is a city and metropolitan borough in the West Midlands, England, with an estimated population of 1,101,360, making it the second most populous city of England and the United Kingdom.

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Bomb disposal

Bomb disposal is the process by which hazardous explosive devices are rendered safe.

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Breathing gas

A breathing gas is a mixture of gaseous chemical elements and compounds used for respiration.

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British Sub-Aqua Club

The British Sub-Aqua Club or BSAC has been recognised since 1954 by the Sports Council as the national governing body of recreational diving in the United Kingdom.

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Buddy breathing

Buddy breathing is a rescue technique used in scuba diving "out of gas" emergencies, when two divers share one demand valve, alternately breathing from it.

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Buddy check

The buddy check is a procedure carried out by scuba divers using the buddy system where each diver checks that the other's diving equipment is configured and functioning correctly just before the start of the dive.

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Buddy diving

Buddy diving is the use of the buddy system by scuba divers.

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In physics, buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object.

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Buoyancy compensator (diving)

A buoyancy compensator, also called a buoyancy control device, BC, BCD, stabilizer, stabilisor, stab jacket, wing or ABLJ depending on design, is a piece of diving equipment with an inflatable bladder which is worn by divers to establish neutral buoyancy underwater and positive buoyancy on the surface, when needed.

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Carbon dioxide

Carbon dioxide (chemical formula) is a colorless gas with a density about 60% higher than that of dry air.

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Cave diving

Cave diving is underwater diving in water-filled caves.

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Christian J. Lambertsen

Christian James Lambertsen (May 15, 1917 – February 11, 2011) was an American environmental medicine and diving medicine specialist who was principally responsible for developing the United States Navy frogmen's rebreathers in the early 1940s for underwater warfare.

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A compass is an instrument used for navigation and orientation that shows direction relative to the geographic cardinal directions (or points).

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Compressed air

Compressed air is air kept under a pressure that is greater than atmospheric pressure.

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Confédération Mondiale des Activités Subaquatiques

Confédération Mondiale des Activités Subaquatiques (CMAS) is an international federation that represents underwater activities in underwater sport and underwater sciences, and oversees an international system of recreational snorkel and scuba diver training and recognition.

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Coral reef

Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals.

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The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.

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Decompression (diving)

The decompression of a diver is the reduction in ambient pressure experienced during ascent from depth.

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Decompression practice

The practice of decompression by divers comprises the planning and monitoring of the profile indicated by the algorithms or tables of the chosen decompression model, to allow asymptomatic and harmless release of excess inert gases dissolved in the tissues as a result of breathing at ambient pressures greater than surface atmospheric pressure, the equipment available and appropriate to the circumstances of the dive, and the procedures authorized for the equipment and profile to be used.

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Decompression sickness

Decompression sickness (DCS; also known as divers' disease, the bends, aerobullosis, or caisson disease) describes a condition arising from dissolved gases coming out of solution into bubbles inside the body on depressurisation.

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Deep diving

Deep diving is underwater diving to a depth beyond the norm accepted by the associated community.

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Depth gauge

A depth gauge is a pressure gauge that displays the equivalent depth in water.

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Displacement (fluid)

In fluid mechanics, displacement occurs when an object is immersed in a fluid, pushing it out of the way and taking its place.

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Distance line

A distance line, penetration line, cave line or guide line is an item of diving equipment used by scuba divers as a means of returning to a safe starting point in conditions of low visibility, water currents or where pilotage is difficult.

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Dive center

A dive center is the base location where recreational divers usually learn scuba diving or make guided dive trips at new locations.

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Dive computer

A dive computer, personal decompression computer or decompression meter is a device used by an underwater diver to measure the time and depth of a dive so that a safe ascent profile can be calculated and displayed so that the diver can avoid decompression sickness.

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Dive planning

Dive planning is the process of planning an underwater diving operation.

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Dive profile

A dive profile is a description of a diver's pressure exposure over time.

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A Divemaster (DM) is a recreational diving role which includes organising and leading recreational dives, particularly in a professional capacity, and is a qualification used throughout most of the world in recreational scuba diving for a diver who has supervisory responsibility for a group of divers and as a dive guide.

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Diver certification

A Diving certification or C-card is a document (usually a wallet sized plastic card) recognizing that an individual or organization authorized to do so, "certifies" that the bearer has completed a course of training as required by the agency issuing the card.

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Diver communications

Diver communications are the methods used by divers to communicate with each other or with surface members of the dive team.

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Diver propulsion vehicle

A diver propulsion vehicle (DPV), also known as an underwater propulsion vehicle or underwater scooter, or swimmer delivery vehicle (SDV) by armed forces, is an item of diving equipment used by scuba divers to increase range underwater.

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Diver rescue

Beaching a casualty while providing artificial respiration Diver rescue, following an accident, is the process of avoiding or limiting further exposure to diving hazards and bringing a diver to a place of safety.

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Diver trim

The stability and static trim of a scuba diver affect the convenience and safety of the diver both at the surface and under water during the dive.

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Divers Alert Network

Divers Alert Network (DAN) is a group of not-for-profit organizations dedicated to improving diving safety for all divers.

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Diving cylinder

A diving cylinder, scuba tank or diving tank is a gas cylinder used to store and transport the high pressure breathing gas required by a scuba set.

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Diving helmet

A Diving helmet is a rigid head enclosure with a breathing gas supply used in underwater diving.

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Diving mask

A diving mask (also half mask, dive mask or scuba mask) is an item of diving equipment that allows underwater divers, including, scuba divers, free-divers, and snorkelers to see clearly underwater.

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Diving physics

Diving Physics are the aspects of physics which directly affect the underwater diver and which explain the effects that divers and their equipment are subject to underwater which differ from the normal human experience out of water.

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Diving regulator

A diving regulator is a pressure regulator that reduces pressurized breathing gas to ambient pressure and delivers it to the diver.

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Diving suit

A diving suit is a garment or device designed to protect a diver from the underwater environment.

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Diving supervisor

The diving supervisor is the professional diving team member who is directly responsible for the diving operation's safety and the management of any incidents or accidents that may occur during the operation; the supervisor is required to be available at the control point of the diving operation for the diving operation's duration, and to manage the planned dive and any contingencies that may occur.

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Diving weighting system

Divers wear weighting systems, weight belts or weights to counteract the buoyancy of other diving equipment, such as diving suits and aluminium diving cylinders.

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Drägerwerk AG is a German company based in Lübeck which makes breathing and protection equipment, gas detection and analysis systems, and noninvasive patient monitoring technologies.

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Dry suit

A dry suit or drysuit provides the wearer with environmental protection by way of thermal insulation and exclusion of water, and is worn by divers, boaters, water sports enthusiasts, and others who work or play in or near cold or contaminated water.

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Duke University Hospital

Duke University Medical Center (commonly referred to as Duke University Hospital) is a 938-acute care bed academic tertiary care facility located in Durham, North Carolina.

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Ear clearing

Ear clearing or clearing the ears or equalization is any of various maneuvers to equalize the pressure in the middle ear with the outside pressure, by letting air enter along the Eustachian tubes, as this does not always happen automatically when the pressure in the middle ear is lower than the outside pressure.

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Emergency ascent

An emergency ascent is an ascent to the surface by a diver in an emergency.

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Emergency locator beacon

An Emergency locator beacon is a radio-frequency beacon used to locate airplanes, vessels, and persons in distress and in need of immediate rescue.

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Emergency management

Emergency management or disaster management is the organization and management of the resources and responsibilities for dealing with all humanitarian aspects of emergencies (preparedness, response, and recovery).

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European Underwater Federation

The European Underwater Federation (EUF) is an umbrella organisation representing the interests of scuba diver training organisations operating in both the not for profit and for profit sectors within Europe.

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Far-sightedness, also known as hyperopia, is a condition of the eye in which light is focused behind, instead of on, the retina.

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Fire department

A fire department (American English) or fire brigade (British English), also known as a fire protection district, fire authority or fire and rescue service is an organization that primarily provides firefighting services for a specific geographic area.

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Fitness to dive

Fitness to dive, (also medical fitness to dive), is the medical and physical suitability of a diver to function safely in the underwater environment using underwater diving equipment and procedures.

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A flare, also sometimes called a fusee, is a type of pyrotechnic that produces a brilliant light or intense heat without an explosion.

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Freediving, free-diving, free diving, breath-hold diving, or skin diving is a form of underwater diving that relies on breath-holding until resurfacing rather than the use of breathing apparatus such as scuba gear.

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A frogman is someone who is trained in scuba diving or swimming underwater in a tactical capacity that includes police or military work.

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Full face diving mask

A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas.

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Global Underwater Explorers

Global Underwater Explorers (GUE) is a scuba diving organization that provides education within recreational, technical and cave diving.

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Guinness World Records

Guinness World Records, known from its inception in 1955 until 2000 as The Guinness Book of Records and in previous United States editions as The Guinness Book of World Records, is a reference book published annually, listing world records both of human achievements and the extremes of the natural world.

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Health and Safety Executive

The Health and Safety Executive (HSE) is the body responsible for the encouragement, regulation and enforcement of workplace health, safety and welfare, and for research into occupational risks in Great Britain.

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Heliox is a breathing gas composed of a mixture of helium (He) and oxygen (O2).

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Helium (from lit) is a chemical element with symbol He and atomic number 2.

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Henry Fleuss

Henry Albert Fleuss (1851–1932) was a pioneering diving engineer, and Master Diver for Siebe, Gorman & Co. of London.

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High-pressure nervous syndrome

High-pressure nervous syndrome (HPNS – also known as high-pressure neurological syndrome) is a neurological and physiological diving disorder that results when a diver descends below about using a breathing gas containing helium.

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Human error

Human error has been cited as a primary cause contributing factor in disasters and accidents in industries as diverse as nuclear power (e.g., the Three Mile Island accident), aviation (see pilot error), space exploration (e.g., the Space Shuttle Challenger Disaster and Space Shuttle Columbia disaster), and medicine (see medical error).

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Human torpedo

Human torpedoes or manned torpedoes are a type of diver propulsion vehicle on which the diver rides, generally in a seated position behind a fairing.

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Hydrology is the scientific study of the movement, distribution, and quality of water on Earth and other planets, including the water cycle, water resources and environmental watershed sustainability.

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Hypothermia is reduced body temperature that happens when a body dissipates more heat than it absorbs.

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Ice diving

Ice diving is a type of penetration diving where the dive takes place under ice.

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Insurance is a means of protection from financial loss.

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International Diving Regulators and Certifiers Forum

The International Diving Regulators Forum (IDRF) confirmed its principals and purpose at their meeting in London in September 2009.

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International Diving Schools Association

International Diving Schools Association (IDSA) was formed in 1982 with the primary purpose of developing common international standards for commercial diver training.

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International Organization for Standardization

The International Organization for Standardization (ISO) is an international standard-setting body composed of representatives from various national standards organizations.

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Jacques Cousteau

Jacques-Yves Cousteau (11 June 1910 – 25 June 1997) was a French naval officer, explorer, conservationist, filmmaker, innovator, scientist, photographer, author and researcher who studied the sea and all forms of life in water.

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Jarrod Jablonski

Jarrod Michael Jablonski (born April 24, 1969) is a pioneering technical diver and record setting cave diver.

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Jogging is a form of trotting or running at a slow or leisurely pace.

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John Morgan Wells

John Morgan Wells (April 12, 1940 - July 28, 2017) was a marine biologist, and physiologist involved in the development of decompression systems for deep diving, and the use of nitrox as a breathing gas for diving.

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Johnson Outdoors

Johnson Outdoors Inc. produces outdoor recreational products such as watercraft, diving equipment, compasses and navigational products, and outdoor clothing.

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Lens (anatomy)

The lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina.

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A lifeguard is a rescuer who supervises the safety and rescue of swimmers, surfers, and other water sports participants such as in a swimming pool, water park, beach or river.

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List of diver certification organizations

This page lists notable underwater diver certification agencies.

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List of diving hazards and precautions

Divers face specific physical and health risks when they go underwater with scuba or other diving equipment, or use high pressure breathing gas.

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Lobsters comprise a family (Nephropidae, sometimes also Homaridae) of large marine crustaceans.

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Major (United States)

In the United States Army, Marine Corps, and Air Force, major is a field grade military officer rank above the rank of captain and below the rank of lieutenant colonel.

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Major trauma

Major trauma is any injury that has the potential to cause prolonged disability or death.

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Marine biology

Marine biology is the scientific study of marine life, organisms in the sea.

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Maximum operating depth

In underwater diving activities such as saturation diving, technical diving and nitrox diving, the maximum operating depth (MOD) of a breathing gas is the depth below which the partial pressure of oxygen (pO2) of the gas mix exceeds an acceptable limit.

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Melbourne is the state capital of Victoria and the second-most populous city in Australia and Oceania.

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National Association of Underwater Instructors

The National Association of Underwater Instructors (NAUI Worldwide) is a non-profit 501 (c) (6) association of scuba instructors.

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National Exhibition Centre

The National Exhibition Centre (NEC) is an exhibition centre located in Birmingham, England.

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Naval Submarine Medical Research Laboratory

The Naval Submarine Medical Research Laboratory (NSMRL) is located on the New London Submarine Base in Groton, Connecticut.

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Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina.

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Neoprene (also polychloroprene or pc-rubber) is a family of synthetic rubbers that are produced by polymerization of chloroprene.

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Nitrogen is a chemical element with symbol N and atomic number 7.

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Nitrogen narcosis

Narcosis while diving (also known as nitrogen narcosis, inert gas narcosis, raptures of the deep, Martini effect) is a reversible alteration in consciousness that occurs while diving at depth.

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Nitrox refers to any gas mixture composed (excepting trace gases) of nitrogen and oxygen.

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National Public Radio (usually shortened to NPR, stylized as npr) is an American privately and publicly funded non-profit membership media organization based in Washington, D.C. It serves as a national syndicator to a network of over 1,000 public radio stations in the United States.

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Oceanography (compound of the Greek words ὠκεανός meaning "ocean" and γράφω meaning "write"), also known as oceanology, is the study of the physical and biological aspects of the ocean.

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Office of Strategic Services

The Office of Strategic Services (OSS) was a wartime intelligence agency of the United States during World War II, and a predecessor of the modern Central Intelligence Agency (CIA).

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Oxygen toxicity

Oxygen toxicity is a condition resulting from the harmful effects of breathing molecular oxygen at increased partial pressures.

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Personal flotation device

A personal flotation device (abbreviated as PFD; also referred to as a life jacket, life preserver, life belt, Mae West, life vest, life saver, cork jacket, buoyancy aid or flotation suit) is a piece of equipment designed to assist a wearer to keep afloat in water.

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Piloting (navigation)

Piloting (on water) or pilotage (in the air also British English) or land navigation is navigating, using fixed points of reference on the sea or on land, usually with reference to a nautical chart, aeronautical chart or topographic map, to obtain a fix of the position of the vessel, aircraft or land traveler with respect to a desired course or location.

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Police diving

Police diving is a branch of professional diving carried out by police services.

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Porpoise (scuba gear)

Porpoise is a tradename for scuba developed by Ted Eldred in Australia and made there from the late 1940s onwards.

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Professional Association of Diving Instructors

The Professional Association of Diving Instructors (PADI) is a recreational diving membership and diver training organization founded in 1966 by John Cronin and Ralph Erickson.

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Professional diving

Professional diving is diving where the divers are paid for their work.

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Psychological stress

In psychology, stress is a feeling of strain and pressure.

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A rebreather is a breathing apparatus that absorbs the carbon dioxide of a user's exhaled breath to permit the rebreathing (recycling) of the substantially unused oxygen content, and unused inert content when present, of each breath.

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Rebreather diving

Rebreather diving is underwater diving using rebreathers, which recirculate the breathing gas already used by the diver after replacing oxygen used by the diver and removing the carbon dioxide metabolic product.

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Recreational diving

Recreational diving or sport diving is diving for the purpose of leisure and enjoyment, usually when using scuba equipment.

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Refractive error

Refractive error, also known as refraction error, is a problem with focusing light accurately onto the retina due to the shape of the eye.

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Refractive index

In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how light propagates through that medium.

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Risk assessment

Risk assessment is the determination of quantitative or qualitative estimate of risk related to a well-defined situation and a recognized threat (also called hazard).

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Risk management

Risk management is the identification, evaluation, and prioritization of risks (defined in ISO 31000 as the effect of uncertainty on objectives) followed by coordinator and economical application of resources to minimize, monitor, and control the probability or impact of unfortunate events or to maximize the realization of opportunities.

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Royal Australian Navy School of Underwater Medicine

The Royal Australian Navy School of Underwater Medicine (RANSUM) is based at Sydney, Australia.

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Scallop is a common name that is primarily applied to any one of numerous species of saltwater clams or marine bivalve mollusks in the taxonomic family Pectinidae, the scallops.

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Scripps Institution of Oceanography

The Scripps Institution of Oceanography (sometimes referred to as SIO, Scripps Oceanography, or Scripps) in La Jolla, California, founded in 1903, is one of the oldest and largest centers for ocean and Earth science research, public service, undergraduate and graduate training in the world.

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Scuba Diving International

Scuba Diving International (SDI) is a Scuba training and certification agency.

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Scuba gas planning

Scuba gas planning is the aspect of dive planning which deals with the calculation or estimation of the amounts and mixtures of gases to be used for a planned dive profile.

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Scuba set

A scuba set is any breathing apparatus that is carried entirely by an underwater diver and provides the diver with breathing gas at the ambient pressure.

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Scuba skills

Scuba skills are the skills required to dive safely using self-contained underwater breathing apparatus, (scuba).

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Sea Hunt

Sea Hunt is an American action adventure television series that aired in syndication from 1958 to 1961 and was popular in syndication for decades afterwards.

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Self-contained breathing apparatus

A self-contained breathing apparatus (SCBA) sometimes referred to as a compressed air breathing apparatus (CABA), or simply breathing apparatus (BA), is a device worn by rescue workers, firefighters, and others to provide breathable air in an immediately dangerous to life or health atmosphere (IDLH).

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Ships husbandry

Ships husbandry or ship husbandry is all aspects of maintenance, cleaning, and general upkeep of the hull, rigging, and equipment of a ship.

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Siebe Gorman

Siebe Gorman & Company Ltd was a British company that developed diving equipment and breathing equipment and worked on commercial diving and marine salvage projects.

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Sign (mathematics)

In mathematics, the concept of sign originates from the property of every non-zero real number of being positive or negative.

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Snorkeling (British and Commonwealth English spelling: snorkelling) is the practice of swimming on or through a body of water while equipped with a diving mask, a shaped breathing tube called a snorkel, and usually swimfins.

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South Pacific Underwater Medicine Society

The South Pacific Underwater Medicine Society (SPUMS) is a primary source of information for diving and hyperbaric medicine physiology worldwide.

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Spiny lobster

Spiny lobsters, also known as langustas, langouste, or rock lobsters, are a family (Palinuridae) of about 60 species of achelate crustaceans, in the Decapoda Reptantia.

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Surface-supplied diving

Surface-supplied diving is diving using equipment supplied with breathing gas using a diver's umbilical from the surface, either from the shore or from a diving support vessel, sometimes indirectly via a diving bell.

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Swimfins, swim fins, fins or flippers are finlike accessories worn on the feet, legs or hands and made from rubber, plastic or combinations of these materials, to aid movement through the water in water sports activities such as swimming, bodyboarding, bodysurfing, kneeboarding, riverboarding, underwater hockey, underwater rugby and various other types of underwater diving.

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Technical diving

Technical diving (also referred to as tec diving or tech diving) is scuba diving that exceeds the agency-specified limits of recreational diving for non-professional purposes.

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The Silent World

The Silent World (Le Monde du silence) is a 1956 French documentary film co-directed by the famed French oceanographer Jacques Cousteau and a young Louis Malle.

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Thermal insulation

Thermal insulation is the reduction of heat transfer (i.e. the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in range of radiative influence.

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Trimix (breathing gas)

Trimix is a breathing gas consisting of oxygen, helium and nitrogen and is often used in deep commercial diving, during the deep phase of dives carried out using technical diving techniques, and in advanced recreational diving.

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Unconsciousness is a state which occurs when the ability to maintain an awareness of self and environment is lost.

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Underwater refers to the region below the surface of water where the water exists in a natural feature (called a body of water) such as an ocean, sea, lake, pond, or river.

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Underwater archaeology

Underwater archaeology is archaeology practiced underwater.

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Underwater diving

Underwater diving, as a human activity, is the practice of descending below the water's surface to interact with the environment.

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Underwater photography

Underwater photography is the process of taking photographs while under water.

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Underwater videography

Underwater videography is the branch of electronic underwater photography concerned with capturing underwater moving images as a recreational diving, scientific, commercial, documentary, or filmmaking activity.

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Underwater vision

Underwater, things are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through the water.

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United States Navy

The United States Navy (USN) is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States.

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Wakulla Springs

Wakulla Springs is located south of Tallahassee, Florida and east of Crawfordville in Wakulla County, Florida at the crossroads of State Road 61 and State Road 267.

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A wetsuit is a garment, usually made of foamed neoprene, which is worn by surfers, divers, windsurfers, canoeists, and others engaged in water sports and other activities in or on water, providing thermal insulation, abrasion resistance and buoyancy.

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World Recreational Scuba Training Council

The World Recreational Scuba Training Council (WRSTC) was founded in 1999 and is dedicated to creating minimum recreational diving training standards for the various scuba diving certification agencies across the world.

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World War II

World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.

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Wreck diving

Wreck diving is recreational diving where the wreckage of ships, aircraft and other artificial structures are explored.

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Yves Le Prieur

Yves Paul Gaston Le Prieur (23 March 1885 – 1 June 1963) was an officer of the French Navy and an inventor.

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[1] https://en.wikipedia.org/wiki/Scuba_diving

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