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A bailout bottle, bailout cylinder or emergency gas supply (EGS) is a scuba cylinder carried by an underwater diver for use as an emergency supply of breathing gas in the event of a primary gas supply failure. A bailout cylinder may be carried by a scuba diver in addition to the primary scuba set, or by a surface supplied diver using either free-flow or demand systems.〔Larn, Richard and Whistler, Rex. 1993 ''Commercial Diving Manual'', 3rd ed. David and Charles, Newton Abbott. ISBN 0-7153-0100-4〕 The bailout gas is not intended for use during the dive except in an emergency. In solo diving, a buddy bottle is a bailout cylinder carried as a substitute for an emergency gas supply from a diving buddy. ==Bailout cylinders for use with scuba== For scuba, a "bailout bottle" or "self-contained ascent bottle" is a small diving cylinder meant to be used as an alternate air source to allow a controlled ascent with any required decompression, in place of a controlled emergency swimming ascent, which will not allow required decompression. A pony bottle is an example of a small bailout cylinder which has a standard diving regulator with first and second stages. There are also significantly smaller cylinders which have the first stage — and in the smallest models also the second stage — integrated into the cylinder valve itself.〔(【引用サイトリンク】title=Bailout Bottle )〕 A well-known example of this class of bailout bottle is the Spare Air set, which can supply a few breaths to allow the diver to ascend at a safe rate, but not enough to do a decompression stop. This type of bailout bottle is typically placed in a holster that is attached to the diver.〔 – Publishers of ''Scuba Diving'' magazine.〕 Since their introduction in the 1980s, "Spare Air" bailout bottles have been the subject of debate within the diving community. The argument against them is that they do not have sufficient capacity to get a diver in many emergency situations back to the surface safely, and thus cause divers to feel a false sense of safety. The argument in favour is that "Spare Air" bottles are both less bulky and less complicated than pony bottles and that some air is better than none if a diver is in an emergency.〔 A review carried out by ''Scuba Diving'' magazine attempted to give a sense of from what depth bailout bottles of various capacities could get divers to the surface under maximum safe ascent rates, though the review cautioned that the reviewers were in controlled conditions and thus could not replicate the circumstances of an actual panicked diver. The review found that a 1.7-cubic-foot (0.24 L) bottle had sufficient air to get the reviewing diver from to the surface; a 3-cubic-foot (0.4 L) bottle from a depth of ; and a 6-cubic-foot (0.8 L) bottle from the maximum reviewed depth of , which is the maximum depth recommended for recreational dives in some parts of the world.〔 A bailout cylinder is defined by its function, and may be carried in any convenient way. The small "Spare Air" type is commonly carried in a pocket type holster which is strapped to the harness where it can easily be reached, usually somewhere on the front of a jacket style buoyancy compensator. Larger bailout cylinders may be strapped to the back cylinder, (see Pony bottle), or suspended from the harness D-rings along the side of the diver as a side-mount, or sling cylinder. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bailout bottle」の詳細全文を読む スポンサード リンク
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