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> But, given the possibility of a CNS O2 hit, with its high probability
> of disaster and (seeming) capriciousness of ocurrence, and the numbing
> effect of nitrogen narcosis, what is the *motivation* behind doing extreme
> air diving, as opposed to heliox or tri-mix, which simply seem to be more
> suitable technologies?

One reason is the availability of the technology at the dive site. I know
of dives in remote locations that were made on deep air (ppO2 ~1.8) because
getting tri-mix in this area was difficult/impossible. Unfortunately, one
of the divers (a very good diver) didn't return.

Devon

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