02 toxicity would occur at 235' on air.....
Where are you getting that number from???
The old idea of 2.0 PP02 would be at 297' on air.
The old idea of 1.6 PP02 would be at 218' on air.
The more commonly accepted 1.4 PP02 would be around 187' on air.
If I am using any type of nitrox or trimix while scuba diving I limit myself to 1.4 PP02 on the bottom and 1.6 at deco. 235' doesn't come up anywhere. I wouldn't want to push that number anywhere, let alone in the cold water around here.
After the explanation that Eric just gave I have no more interest in trying any type of nitrox freediving. Skip breathing on nitrox would be very easy and C02 blackouts would seem to be pretty easy to happen since most experienced divers are C02 retainers to begin with.
I guess that if I really wanted to try and cheat the system I would just build a sled instead.
Jon
