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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
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 ...
Main article: Anthodite A speleothem (cave formation) composed of long needle-like crystals situated in clusters which radiate outward from a common base. B Belly crawl A passage that is very low. Biospeleology Main article: Biospeleology A branch of biology dedicated to the study of organisms that live in caves and are collectively referred to as troglofauna. Boneyard An intricate maze of ...
Scientific diving is the use of underwater diving techniques by scientists to perform work underwater in the direct pursuit of scientific knowledge. [11] Scientific divers are normally qualified scientists first and divers second, who use diving equipment and techniques as their way to get to the location of their fieldwork.
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 ...
In free-diving cormorants, heart rate dropped at the start of the dive, and usually stabilized at depth, but increased again at the start of the ascent, with average heart rates during the dive much the same as at rest, but the variation in heart rate and vasoconstriction varies considerably between species, and true bradycardia occurs in ...
The Bathysphere on display at the National Geographic museum in 2009. The Bathysphere (from Ancient Greek βαθύς (bathús) 'deep' and σφαῖρα (sphaîra) 'sphere') was a unique spherical deep-sea submersible which was unpowered and lowered into the ocean on a cable, and was used to conduct a series of dives off the coast of Bermuda from 1930 to 1934.