The local diver we had who was so badly hurt has a similar story -- he was diving, and the next thing he knew, he was out of gas. That was roughly at 200 feet, and he had done those depths many times before.
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Brett Gilliam mentions divers falling asleep at depths past 300 in the "Deep Diving" book. These divers are not reported as having traditional Ox Tox symptoms of seizures, rather they just drifted off to sleep, then recovered either on the way up by themselves or with another diver helping them up. Not sure where these fit into...oxtox or CO2?
One other diver was found with the regulator in his mouth just like he had nodded off to sleep on the Promenade Deck, IIRC on one of the many Andrea Dorea dives covered by either Gary Gentile or Bernie Chowdhury.
Brett Gilliam mentions divers falling asleep at depths past 300 in the "Deep Diving" book. These divers are not reported as having traditional Ox Tox symptoms of seizures, rather they just drifted off to sleep, then recovered either on the way up by themselves or with another diver helping them up.
Since N2 Narcosis appears to be a consequence of N2 acting as a CNS depressant, surely it's inevitable that, given a high enough ppN2, the diver will 'go on the nod'? Or am I completely misunderstanding the (probable) mechanism?