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This is a glossary of technical terms, jargon, diver slang and acronyms used in underwater diving. The definitions listed are in the context of underwater diving. There may be other meanings in other contexts. Underwater diving can be described as a human activity – intentional, purposive, conscious and subjectively meaningful sequence of ...
free-diving. Main article: Free-diving. Underwater diving that does not involve the use of external breathing apparatus, but relies on a diver's ability to hold their breath until resurfacing. See also breath-hold diving, and apnea (q.v.) free-flow 1. Constant flow rate air supply 2. See: Mechanism of diving regulators#Free-flow
Fins and a diving mask are often used in free diving to improve vision and provide more efficient propulsion. A short breathing tube called a snorkel allows the diver to breathe at the surface while the face is immersed. Snorkelling on the surface with no intention of diving is a popular water sport and recreational activity. [38] [44]
Cave diving, wreck diving, ice diving and diving inside or under other natural or artificial underwater structures or enclosures are examples. The restriction on direct ascent increases the risk of diving under an overhead, and this is usually addressed by adaptations of procedures and use of equipment such as redundant breathing gas sources ...
The standard procedures and activities essential to safe diving in the chosen diving mode, using the chosen diving equipment, and in the chosen diving environment are inherently part of the activities of a dive. Monitoring the dive profile, gas supplies, decompression status, relative positions of the divers and communication associated with ...
Scuba diver in Panama. Recreational diving may be considered to be any underwater diving that is not occupational, professional, or commercial, in that the dive is fundamentally at the discretion of the diver, who dives either to their own plan, or to a plan developed in consensus with the other divers in the group, though dives led by a professional dive leader or instructor for non ...
Fitness to dive (more specifically medical fitness to dive) refers to the medical and physical suitability of a diver to function safely in an underwater environment using diving equipment and related procedures. Depending on the circumstances, it may be established with a signed statement by the diver that they do not have any of the listed ...
For example, due to the long swims involved in California shore diving, divers use snorkels until they reach a good start point for a dive to maximise air supply for the actual dive. [ 96 ] A snorkel can be a useful substitute for a pocket mask for in-water EAR , a diving accident victim can be towed and have rescue breathing administered ...