Yes, I agree with TheDude - I'd also tell that the hyperventilation is a likely cause of the blackout. Unless hyperventilated (or naturally alcalic), or extremely motivated, beginners are rarely able to hold their breath in static apnea till blackout. But of course, there may be many other factors involved, so it is hard to tell. I definitely do not think that combining the CO2 and O2 tables was the reason - this is a classical training we do in our club even with beginners. There were already many tens of beginners going through the training, and we never had yet any BO during the training. And as far as I remember we did not even had any LMC during static apnea training, although our tables are more aggressive than those mentioned here. It is certainly not because the level of our beginners is better than elsewhere, but especially because the security measures are on a very high level during the training sessions. As soon as someone fails to response to a signal, he is pulled out immediately. Hyperventilation is not allowed. Also if someone shows signs of hypoxia (blue lips, dizziness,...) or hypothermia or other problems, he/she is sent out of the water and may not continue in the training.
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