Using O2 on NDL dives

[scububa]

I agree with BigBob that a 50% mix would be better. Alot less chance of taking an O2 hit, and you've got a bailout gas. With that said, I've seen about 300 people take an Oxygen Tolerance test 60' on 100% for 30 minutes and I've never seen a hit.

Were these in-chamber or in-water?