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The recent thread on plumbing for doubles reminds me of an article in the
last Underwater Speleology (NSS-CDS mag.) on buddy bottles.  The argument was
that there have been documented failures of manifolds which dump a diver's
entire air supply, which of course means death for a solo cave dive.  The
author suggested that independents were safer in principle, but that the task
loading associated with regulator switches somewhat offset this.

The proposed solution was a buddy bottle, which seems like a caver's
equivalent of a large pony bottle.  It's a stage bottle which contains enough
air to get you out at point of deepest penetration, but which isn't included
in air planning since it isn't used except in emergencies.

Maybe the old timers in the wreck community who insist on carrying a pony
bottle of bottom mix on their dual-outlet isolation manifolds have the right
idea after all.

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