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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.
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]
Inability to achieve neutral or positive buoyancy, and potential difficulty or inability to make controlled ascent or to ascend at all. Catastrophic leak in buoyancy compensator: Loss of manifold fitting. Corrugated hose failure. Torn bladder. Maintenance and inspection of BC before use. Use of drysuit as emergency buoyancy control device
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In a controlled emergency swimming ascent (CESA), the ascent remains under control and is performed at a safe rate. In an emergency swimming ascent (ESA), the diver swims to the surface at either negative or approximately neutral buoyancy. Other forms of ascent which may be considered emergency ascents are:
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