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Suppose that you hear a large amount of gas being released  behind your head
during the working portion of an overhead enviornment dive. I personally have
an isolation manifold.
With your buddy almost immediately available what is your reaction to turn
off and or isolate cylinders?
Would you first isolate your bottom gas (not knowing whether the problem was
a tank oring/burst disc/1st stage to valve/hose problem) or would emphasis be
on turning off a first stage's supply?

--rich

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