No, this is not the problem. The problem is that you are hypoventilating in relation to the CO2 you are producing (in retention), or that you are rebreathing CO2 (in scrubber failure).

Yes you are hypoventilating, partly due to the psychological stress, but partly due to the higher levels of CO2 in your body. It is after all CO2 levels in the body that stimulates the breathing reflex. So as long as you have higher CO2 levels in your body, you will breathe heavier.


No its not. The last thing you want to do in the middle of a CO2 toxicity event is increase your PO2, even by a little.

Do you have any evidence to back this up?
So say you are diving a setpoint of 1.3, and your deep bailout has a PPO2 of 1.4-1.5 (Which is quite common practice) then what??

If anything, there might be an argument for a very light (helium-rich) bailout so that if you do bail in the middle of a CO2 (hit) the work of breathing is as low as you can possibly make it.

Regards,

Simon M

"not-very-hot" What do you consider hot?

I was trained to run a PPO2 of 1.2 under most normal circumstances and maybe bump it up for deco. 1.6 is absolute max.