Aren't the PADI guidelines for this sort of thing no greater than 32% Nitrox because of the danger of O2 toxicity?![]()
I prefer 100% actually but (IMO) air breaks should be taken every 10 minutes rather than twenty... However, this is "diver" dependent on how much they are actually working and especially how long.. :shocked2:
PS. I'm not a PADIphile so what might not kill me may be dangerous to the aforementioned group adhering to their teachings.

[/ a possibly poor attempt at levity]