[jome]

Just wanted to say in case anyone tries that (pure o2 as tolerance training) that be very VERY careful. Co2 narcosis and respiratory acidosis are not something to be taken lightly...I've heard a very chilling first person account of such an incident, and it was not funny. You don't necessarily come around from a hypercapnic blackout the same way you do from a hypoxic one. I'm sure Eric and other experienced divers reading this are aware of that, but some might not be.

I recommend against O2 statics all together, but if someone does go on and try it (and there's always people who will), please start with very conservative results, only topping your "air pb", by very small increments.