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John
I concur with your sentements. Whilst the cave diving over here in the
UK is a COMPLETELY DIFFERENT ANIMAL to the US stuff, the tech diving scene is
covering similar ground. Most of the people that are doing the serious stuff
operate one of two systems.
1. Manifolded doubles with two take offs. One reg has a std length hose on, one
has a 2 metre hose. The dive is done on the std. length hose. In an out of
air/equipment malfunction situation the affected diver will either grab the reg
you are breathing from, or grab the one on the long hose. Either way they have
gas!. Then you can either switch once breathing is established or leave well
alone.
2. Independant doubles: since continuous reg switching is required to persue the
'thirds' rule it is a similar situation. The diver 'in the mire!' will go for
what they go for!!!!!. You can then sort out the swapping of regs etc when
things have settled down a little.
As a matter of record I prefer manifolded to independant as regards gas
management.
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