Quote: (Originally Posted by
plazma)

I felt very exhausted when breathing 16/35 on surface while swimming against strong current. Exhaustion went away when I discarded the regulator and breather air.
You probably tolerated PPO2 0.05 because you were sitting still.
-Pasi
is'nt it so that you just tolerated 0.05 for a short time because your brain has residual oxigen from breathing before, and it is just a matter of time before you pass away??
imagine breathing a 5% mix from a regulator at surface: you will not go unconcious after one breath, but it will not work for 10 minutes..
paul