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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
Freediving, free-diving, free diving, breath-hold diving, or skin diving, is a mode of underwater diving that relies on breath-holding until resurfacing rather than the use of breathing apparatus such as scuba gear.
Any dive where the diver is decompressed directly after the dive. [25] 2. In recreational diving, a bounce dive is a descent to maximum depth and then a direct ascent back to the surface with minimal bottom time, in a dive profile resembling a spike. BOV. See: bailout valve. bowline. Main article: Bowline
1. Diving from a boat which is under way (not moored). The major implication is that the engines will be running and propellers or thrusters may be engaged while divers are in the water, a significant hazard. [66] 2. (offshore diving) Diving from a vessel underway, making way, but not using dynamic positioning.
First tie off of the guideline in a penetration dive. This is usually made in a place with free vertical access to the surface. [23] professional diving. Main article: Professional diving. Also: occupational diving. Diving which is done as part of the diver's employment or professional occupation. Definitions vary in different jurisdictions. [24]
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.
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]