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Originally Posted by efattah
He was always instructed never to hyperventilate, and by under-breathing people have hypothesized that he had a CO2 blackout on the bottom, but no one knows for sure.
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I didn't know that could happen. I don't normally hyperventilate heavily, but I do always take a few forced deep breaths before a dive. This is because I don't want to have so much CO2 that I can't deal with the situation. My CO2 tolerance is quite good, and even better if I have been training a lot, but extremely high CO2 is a situation I want to avoid unless I am very near the surface and have a competent buddy.
Lucia
