Pony Bottles in Technical Diving
In technical diving, where larger volumes of breathing gas need to be supplied the usefulness of pony bottles greatly diminishes. This type of diving is the province of twinsets, rebreathers or even more complex assemblages. The diver however still needs to consider bailout – an interruption of the planned dive by breathing gas problems that requires a safe exit to the surface. In certain technical diving equipment configurations the use of larger pony bottles can again come to the fore, particular if the diving is not excessively deep and decompression requirements are modest. An example can be in the case of rebreathers, where the diluent gas supply is also used as a bailout bottle for rebreather failure. The capacity of the diluent bottle is very often insufficient for this bailout purpose, and an appropriate larger sized pony can serve as a "backup to the bailout".
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