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  Richard Pyle <deepreef@bi*.bi*.Ha*.Or*> wrote:-

> [Bends from oxygen bubbles can occur] ... As for narcosis: as someone who
> has breathed pure O2 at a simulated (chamber) depth of 220 feet, I can
> report that, as far as I could tell, the narcosis severity was approximately
> equal to what I would have experienced at the same depth breathing air.

  200 feet on pure oxygen: however did you avoid blacking out or convulsing!?
  But at least an oxygen rebreather plus a medication to prevent oxygen
poisoning, would be a LOT easier with a much lighter and more streamlined
breathing set down to say 150 to 200 feet. No diluent to carry about. No need
for an onboard computer and ppO2 meters to have to #@$% about with gas ratios.

  Someone else writing about oxygen diving said:-
> Flame away

  And likely a lot hotter than in air, like in oxy-gas blowtorches. If the
set's diluent is hydrogen, as used occasionally, a work diver could run
himself and his blowtorch off the same cylinders!

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