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Many of the terms are in general use by English speaking divers from many parts of the world, both amateur and professional, and using any of the modes of diving. Others are more specialised, variable by location, mode, or professional environment.
Repetitive dive which is shallower than the previous dive. [56] Multilevel dive in which a later level is shallower than an earlier level. [56] forward roll entry. See: Scuba skills#Entries. Water entry technique used by scuba divers from a boat or platform too high or unsuitable for backward roll entry. The diver bends forward at the hips and ...
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 ...
For example, a medical statement or examination for fitness, pre-dive site assessment and briefing, safety drills, thermal protection, equipment redundancy, alternative air source, buddy checks, buddy or team diving procedures, dive planning, use of dive computers to monitor and record the dive profile and decompression status, underwater hand ...
The neck of plunge-diving birds is also unique. Plunge-diving birds can dive from heights up to 45 m and reaching speed up to 24 m/s without injury. Their neck plays a big role when plunge-diving. Their neck muscle will contract during the impact process, and the tendons will apply tension to the bones as a stabilizing force during the dive. [7]
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 ...
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The history of scuba diving is closely linked with the history of scuba equipment.By the turn of the twentieth century, two basic architectures for underwater breathing apparatus had been pioneered; open-circuit surface supplied equipment where the diver's exhaled gas is vented directly into the water, and closed-circuit breathing apparatus where the diver's carbon dioxide is filtered from ...