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>If using nitrox at high altitude, e.g., 12,000 feet above mean sea
>level, I would think that the higher partial pressure of oxygen would
>contribute toward a greater possibility of hypoxia when surfacing
>relative to using compressed air.  

I've now seen this a few times...

Now what on earth would ever cause you to think that?  *IF* you can
breath the air before the dive and not be hypoxic, why would you EVER
think that you'll be hypoxic AFTER the dive - doesn't make any
sense...  Same goes for air...  

The big difference between the two is the lower N2 in your system when
using Nitrox so you have three choices -

1) dive air tables and have a wide margin of safety 

2) use Nitrox tables and extend your bottom time

3) dive deeper than you would have due to the AED of Nitrox (provided
you still limit yourself to appropriate PPO2's).

Of course anyone with half a brain can use anyone of these methods and
stay safe while others will just do stupid things, no matter where
they dive.

-Carl-

The problem with common sense is that it isn't too common!!!

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