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Emergency free ascent (EFA) is like a controlled emergency swimming ascent without a regulator in the mouth. It is considered unacceptably hazardous for training purposes by some agencies. [6] [7] Emergency swimming ascent (ESA) is a free ascent where the diver swims to the surface at either negative or approximately neutral buoyancy.
Controlled emergency swimming ascent; D. Diver rescue; E. Emergency air sharing; Emergency ascent; Emergency breathing gas sharing; Emergency buoyant ascent;
Lost weights ascent with flare – Mitigation of an incident where the diver cannot neutralise positive buoyancy. Controlled buoyant emergency ascent – Fine control of buoyancy to ascend at an acceptably safe rate. Emergency swimming ascents – Emergency ascent where the diver actively swims upward at approximately neutral buoyancy.
The procedures are intended to limit risk of barotrauma of ascent and decompression sickness, while maintaining an efficient ascent profile. One of the most important criteria for a controlled ascent is control of the ascent rate, both during the periods of active ascent (pulls), and periods of staged decompression (stops). [5]
Controlled emergency swimming ascent; D. DAN World; Decompression chamber operation; Decompression planning; Deep air diving blackout; Delta-P (hazard)
Emergency procedure – Plan of action to deal with an emergency; Emergency Response Diving International (ERDI) – American organisation for training and certification of emergency response divers; Emergency response plan – Action to be taken in specific emergencies; Emergency swimming ascent (ESA) – Emergency procedure used by scuba divers
Controlled emergency swimming ascent (CESA) – Emergency procedure for scuba divers when out of air; Coral reef – Outcrop of rock in the sea formed by the growth and deposit of stony coral skeletons; Coral Reef Alliance – Non-profit, environmental NGO focused on protecting coral reefs
Such constraints may include: limiting the ascent rate; making stops during the ascent additional to any decompression stops; limiting the number of dives performed in a day; limiting the number of days of diving within a week; avoiding dive profiles that have large numbers of ascents and descents; avoiding heavy work immediately after a dive ...