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Kevin Connell wrote:
> 
> You'd never be able to breath a tank down much below the IP, anyway.  I've
> sucked my O2 bottle dry numerous times, and there is always some gas left
> in it.

  Interesting Kevin.  I just witnessed a diver drain his 30 on a 20'
stop.  BTW, he had no spg.  He had a mk10/g250.  Interemediate pressure
should be about 145 psi.  Ambient pressure absolute at 20fsw = about
23.6 psi.  After a conversation with this diver I turned his 30 upside
down, opened the valve and guess what?  Mucho Agua!  I would guess that
the tank pressure had to of droped well below intermediate to do this.

  Later,  John
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