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   I have been cave diving now for over five years, with over three hundred
logged cave dives.  The divers I know have no problem diving in the 230'+
range (myself included), but would never dive outside the operational depth
of any mix.  Seems the major consideration while on air is either the deco
requirements or the narcosis factor, but not the PO2.  
 I have a question regarding PO2 toxicity.  When diving a mix, whether it be
trimix or nitrox, the operating depth is extremely important.  But the same
consideration is not given when diving compressed air deeper than 218' (PO2
1.6).  Why does it seem that diving compressed air at high PO2's seems much
more forgivable than a mix with a comparable PO2?
   Any feed back to this question (I hope that this was not beat to death
before my recent arrival on the net)would be appreciated.

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