Eric,
It sounds like deep water blackout that your describing. It is most common amongst deep air divers who don't ventilate properly while breathing- either due to cheap regulators, improper breathing patterns, or just diving too deep on air. It causes co2 build ups in the body which result in the loss of consiousness.
Longtime scuba divers are more prone to this because they are conditioned to be co2 retainers and may also not breath enough, or are working too hard at depth. There have been cases were divers black out from co2 on deep air dives and are revived by their buddies on the ascent.
The ox-tox that I am talking about are more like epileptic seizures. Divers that switch to the wrong gas at depth can go into flailing convulsions that result in loss of consiousness, regulator mouth piece, and life. Who knows how deep a freediver has to get, or how long his exposure is at that depth, before we start to this happen.
Like I said before, a controlled experiment.
Jon
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