Manos, One other important operational consideration: if you have an emergency and completely lose your O2 at 20', you CAN deco to the surface on 50% O2 (gas supply permitting). (Don't) try that with 36% Nitrox... Safe diving, Nelson Perry -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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