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> A small volume scuba cylinder of EAN39 carried with a diver for a
> decompression gas can also be a redundant gas supply.  In the event
> that the primary gas supply is exhausted, the diver can switch to
> EAN39 and make a normal ascent.  If this emergency occurred at 130 fsw,
> the pO2 for EAN39 would be 1.92 ATA.  Although the recommended maximum
> oxygen depth limit for EAN39 is 102 fsw (pO2 1.6 ATA) the exposure
> time for an ascent from 130 fsw to 100 fsw would only be 30 seconds.


	TDI	Twitching Diver's Inquest
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