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A pair of demand valves fitted to a scuba regulator Navy surface supplied diver with back mount bailout cylinder Solo scuba diver with sling mount bailout cylinder. In underwater diving, an alternative air source, or more generally alternative breathing gas source, is a secondary supply of air or other breathing gas for use by the diver in an emergency.
"Spare Air" bailout bottles, introduced in the 1980s, are very small cylinders with integral scuba regulators. Their disadvantage is that in many emergency situations they do not have sufficient capacity to get a diver back to the surface safely, and thus may cause divers carrying them to feel an unjustified sense of safety.
Another type of small independent air source is a hand-held cylinder filled with about 85 litres (3.0 cu ft) of free air with a diving regulator directly attached, such as the Spare Air. [64] This source provides only a few breaths of gas at depth and is most suitable as a shallow water bailout.
Thus, the surface-supplied diver is less likely to have an "out-of-air" emergency than a scuba diver using a single gas supply, as there are normally two alternative breathing gas sources available. Surface-supplied diving equipment usually includes communication capability with the surface, which improves the safety and efficiency of the ...
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.
a "spare air" - a small independent scuba set with integrated regulator and mouthpiece A potentially independent pair of twins connected by an isolation manifold and carried by the diver. If the diver can isolate them in time, the remaining gas in the uncompromised side is available.