One of the biggest reasons that is going to force you off the loop would be CO2. Are the 7's enough to cope with a bailout on the bottom in that case?
Ahhh... the great alpinist debate again

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Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you?
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Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler