Scuba set

scubascuba equipmentscuba gearopen circuitopen circuit scubaself-contained underwater breathing apparatusbreathing apparatusscuba setsbreathing setsunderwater breathing apparatus
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.wikipedia
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Breathing gas

breathing gasesmixed gasGas
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. Unlike other modes of diving, which rely either on breath-hold or on breathing supplied under pressure from the surface, scuba divers carry their own source of breathing gas, usually filtered compressed air, allowing them greater freedom of movement than with an air line or diver's umbilical and longer underwater endurance than breath-hold.
But other mixtures of gases, or pure oxygen, are also used in breathing equipment and enclosed habitats such as scuba equipment, surface supplied diving equipment, recompression chambers, high-altitude mountaineering, high-flying aircraft, submarines, space suits, spacecraft, medical life support and first aid equipment, and anaesthetic machines.

Diving equipment

equipmentdiving knifescuba gear
Although strictly speaking the scuba set is only the diving equipment which is required for providing breathing gas to the diver, general usage includes the harness by which it is carried, and those accessories which are integral parts of the harness and breathing apparatus assembly, such as a jacket or wing style buoyancy compensator and instruments mounted in a combined housing with the pressure gauge, and in the looser sense it has been used to refer to any diving equipment used by the scuba diver, though this would more commonly and accurately be termed scuba equipment or scuba gear.
The fundamental item of diving equipment used by divers is underwater breathing apparatus, such as scuba equipment, and surface supplied diving equipment, but there are other important pieces of equipment that make diving safer, more convenient or more efficient.

Acronym

initialismacronymsinitials
Scuba is an anacronym for self-contained underwater breathing apparatus.
The most common capitalization scheme seen with acronyms is all-uppercase (all-caps), except for those few that have linguistically taken on an identity as regular words, with the acronymous etymology of the words fading into the background of common knowledge, such as has occurred with the words "scuba", "laser", and "radar"—these are known as anacronyms.

Christian J. Lambertsen

Christian LambertsenChris LambertsenLambertsen
The word SCUBA was coined in 1952 by Major Christian Lambertsen who served in the U.S. Army Medical Corps from 1944 to 1946 as a physician.
Although diving regulator technology was invented by Émile Gagnan and Jacques-Yves Cousteau in 1943 and wasn't originally related to rebreathers, the current use of the word SCUBA is largely attributed to Gagnan's and Cousteau's invention.

Freediving

free-divingfreediverfree-diver
Unlike other modes of diving, which rely either on breath-hold or on breathing supplied under pressure from the surface, scuba divers carry their own source of breathing gas, usually filtered compressed air, allowing them greater freedom of movement than with an air line or diver's umbilical and longer underwater endurance than breath-hold.
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.

Recreational diving

recreational diversrecreationalrecreational scuba diving
Scuba diving may be done recreationally or professionally in a number of applications, including scientific, military and public safety roles, but most commercial diving uses surface supplied diving equipment for main gas supply when this is practicable.
Recreational diving or sport diving is diving for the purpose of leisure and enjoyment, usually when using scuba equipment.

Surface-supplied diving

surface supplied divingsurface suppliedpneumofathometer
Unlike other modes of diving, which rely either on breath-hold or on breathing supplied under pressure from the surface, scuba divers carry their own source of breathing gas, usually filtered compressed air, allowing them greater freedom of movement than with an air line or diver's umbilical and longer underwater endurance than breath-hold. Scuba is overwhelmingly the most common underwater breathing system used by recreational divers and is also used in professional diving when it provides advantages, usually of mobility and range, over surface supplied diving systems, and is allowed by the relevant code of practice.
The cameramen used ordinary scuba gear, but one of them had a trial-dive with the crew's compressor-diving gear.

Snorkel (swimming)

snorkelsnorkel-likesnorkels
The integrated version is only suitable for surface snorkeling, while the separate device may also be used for underwater activities such as spearfishing, freediving, finswimming, underwater hockey, underwater rugby and for surface breathing with scuba equipment.

Frogman

frogmencombat divercombat divers
Other specialist areas of scuba diving include military diving, with a long history of military frogmen in various roles.
The preferred term by scuba users is diver, but the frogman epithet persists in informal usage by non-divers, especially in the media and often referring to professional scuba divers, such as in a police diving role.

Self-contained breathing apparatus

SCBAbreathing apparatusself contained breathing apparatus
His self contained breathing apparatus consisted of a rubber mask connected to a breathing bag, with an estimated 50–60% oxygen supplied from a copper tank and carbon dioxide scrubbed by passing it through a bundle of rope yarn soaked in a solution of caustic potash, the system giving a dive duration of up to about three hours.
If designed for use under water, it is called SCUBA (self-contained underwater breathing apparatus).

Human torpedo

manned torpedomanned torpedoeshuman torpedoes
Their roles include direct combat, infiltration behind enemy lines, placing mines or using a manned torpedo, bomb disposal or engineering operations.

Professional diving

commercial diverprofessional diversprofessional diver
Scuba diving may be done recreationally or professionally in a number of applications, including scientific, military and public safety roles, but most commercial diving uses surface supplied diving equipment for main gas supply when this is practicable. Scuba is overwhelmingly the most common underwater breathing system used by recreational divers and is also used in professional diving when it provides advantages, usually of mobility and range, over surface supplied diving systems, and is allowed by the relevant code of practice.
Initial training is carried out mainly on conventional open circuit scuba equipment but with the increasing availability of recreational rebreathers, their use is also taught.

Aqua-Lung

aqualungaqualungsAqua Lung
Open-circuit-demand scuba is a 1943 invention by the Frenchmen Émile Gagnan and Jacques-Yves Cousteau, but in the English language Lambertsen's acronym has become common usage and the name Aqua-Lung (often spelled "aqualung"), coined by Cousteau for use in English-speaking countries, has fallen into secondary use. To sell his regulator in English-speaking countries Cousteau registered the Aqua-Lung trademark, which was first licensed to the U.S. Divers company, and in 1948 to Siebe Gorman of England, Siebe Gorman was allowed to sell in Commonwealth countries, but had difficulty in meeting the demand and the U.S. patent prevented others from making the product. The word Aqua-Lung, which first appeared in the Cousteau-Gagnan patent, is a trademark, currently owned by Aqua Lung/La Spirotechnique.
Aqua-Lung was the first open-circuit, self-contained underwater breathing apparatus (or "SCUBA") to reach worldwide popularity and commercial success.

Snorkeling

snorkellingsnorkelsnorkelers
The integrated version is only suitable for surface snorkeling, while the separate device may also be used for underwater activities such as spearfishing, freediving, finswimming, underwater hockey, underwater rugby and for surface breathing with scuba equipment.

Cave diving

cave divercave diverscave
It originated as a configuration for advanced cave diving, as it facilitates penetration of tight sections of cave as, sets can be easily removed and remounted when necessary.
The equipment used varies depending on the circumstances, and ranges from breath hold to surface supplied, but almost all cave diving is done using scuba equipment, often in specialised configurations with redundancies such as sidemount or backmounted twinset.

Porpoise (scuba gear)

PorpoisePorpoise (make of scuba gear)Porpoise diving equipment
Eldred sold the first Porpoise Model CA single hose scuba early in 1952.
Porpoise is a tradename for scuba developed by Ted Eldred in Australia and made there from the late 1940s onwards.

Scientific diving

scientificscientific diversEuropean Scientific Diving Panel
There are also professional divers involved with underwater environment, such as underwater photographers or underwater videographers, who document the underwater world, or scientific diving, including marine biology, geology, hydrology, oceanography and underwater archaeology.

Diving helmet

helmetfree-flow helmetsKirby Morgan
They are worn mainly by professional divers engaged in surface-supplied diving, though some models can be used with scuba equipment.

Air Liquide

U.S. DiversLurgiLurgi AG
To sell his regulator in English-speaking countries Cousteau registered the Aqua-Lung trademark, which was first licensed to the U.S. Divers company, and in 1948 to Siebe Gorman of England, Siebe Gorman was allowed to sell in Commonwealth countries, but had difficulty in meeting the demand and the U.S. patent prevented others from making the product.

Aqua Lung/La Spirotechnique

La SpirotechniqueAqua Lung InternationalAqualung
The word Aqua-Lung, which first appeared in the Cousteau-Gagnan patent, is a trademark, currently owned by Aqua Lung/La Spirotechnique.
La Spirotechnique (now Aqua Lung International) is a large and well-known firm which makes scuba and other self-contained breathing apparatus, and other diving equipment.

Johnson Outdoors

ScubaproHealthwaysUwatec
In 1971 the stabilizer jacket was introduced by ScubaPro.
Healthways was a firm founded by Dick Klein which made scuba gear.

Submarine Products

Submarine Products Ltd
At one time a firm called Submarine Products sold a sport air scuba set with three manifolded back-mounted cylinders.
Submarine Products Ltd were the first company to make scuba sets readily available to the public in the United Kingdom.

Breathing tube (breathing apparatus)

breathing tubebreathing tubesbreathing hoses
Two large bore corrugated rubber breathing hoses connect the regulator with the mouthpiece, one for supply and one for exhaust.
A breathing tube is a flexible tube for breathing through, as part of a scuba set or other breathing apparatus or a medical oxygen apparatus or anaesthetic apparatus (Here they are distinguished from the medium-pressure hoses which are often found as parts of modern breathing apparatus.)

Sea Hunt

Sea Hunt (1961), Season 4, Episode's 29 & 37Sea Hunt ?Seahunt
This is the first type of diving demand valve to come into general use, and the one that can be seen in classic 1960s television scuba adventures, such as Sea Hunt.
Mike Nelson (Bridges) is a free-lance scuba diver who has various adventures.

Backplate and wing

backplateback mountedMetal backplates
Another popular configuration is the backplate and wing arrangement, which uses a back inflation buoyancy compensator bladder sandwiched between a rigid backplate and the main gas cylinder or cylinders.
The STA is a small metal structure that bolts onto the backplate on the outside of the wings, contains two camstraps, and accommodates the cylinder.