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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.
A pony bottle or pony cylinder is a small diving cylinder which is fitted with an independent regulator, and is usually carried by a scuba diver as an auxiliary scuba set.In an emergency, such as depletion of the diver's main air supply, it can be used as an alternative air source or bailout bottle to allow a normal ascent in place of a controlled emergency swimming ascent.
Controlled emergency swimming ascent – Ascent where there may be a small amount of breathing gas which becomes available due to ambient pressure reduction. Cut free from entanglement. Ditch weights to establish buoyancy – Removal of some or all ballast weights to establish neutral or positive buoyancy underwater, or to establish positive ...
When no redundant air supply is available, the diver can make a controlled emergency swimming ascent. The diver starts to swim up exhaling steadily along the ascent unless trying to inhale. The mouthpiece is kept in as the cylinder still contains some air and it will become available as the ambient pressure decreases.
Gas may find its way into a cavity in the tooth or under a filling or cap during a dive and become trapped. During ascent, this gas will exert pressure inside the tooth. Good dental hygiene, and maintenance of dental repairs to prevent or remove potential gas traps. Suit and BC expansion Loss of buoyancy control—uncontrolled ascent.
Controlled emergency swimming ascent; D. Diver rescue; E. Emergency air sharing; Emergency ascent; Emergency breathing gas sharing; Emergency buoyant ascent;
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C. Catastrophic dry suit flooding; Caustic cocktail; Chamber operation; Charging pressure; Checkout dive; Chief of safety; Chief of safety (freediving) Civil liability in recreational diving