| Re: why do we do it? This is at least part of the reason why the riskier part of the dive is on the surface or while ascending. It's also the reason why I make sure to put a good shot of O2 into the loop as I approach the boat ladder. If there were any kind of delay in getting out of the water, I want to make sure I am well above the hypoxic level as I am busy with other things. |