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Emergency ascent
An emergency ascent is an ascent to the surface by a diver in an emergency. More specifically it refers to any of several procedures for getting to the surface in the event of an out-of-air emergency, generally while scuba diving.
Emergency ascents may be broadly categorised as independent ascents, where the diver is alone and manages the ascent by him/herself, and dependent ascents, where the diver is assisted by another diver, who generally provides breathing gas, but may also provide transportation or other assistance. The extreme case of a dependent ascent is underwater rescue or recovery of an unconscious or unresponsive diver, but this is more usually referred to as diver rescue, and emergency ascent is usually used for cases where the distressed diver is at least partially able to contribute to the management of the ascent.
An emergency ascent usually implies that the diver initiated the ascent voluntarily, and made the choice of the procedure. Ascents that are involuntary or get out of control unintentionally are more accurately classed as accidents.
==Terminology for emergency ascents==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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