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Very experienced diver, thinks "I'm just going to get the buoy, don't need help" - too easy to imagine.
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And I stand by my original statement, we have no idea of what happened to this diver, shallow water blackout on a 20 or even 40 foot dive (slightly more than a doubling of ambient pressure) is rather unlikely for any number of reasons (not the least being the laws of physics).I know, Steve. A very informed & experienced diver told me recently on another Accident thread here that anyone should be able to free dive alone to 40 ft alone, no problem. Can't believe everything you read, even from the best. Tony was much younger, fitter and more experienced than I it seems. Damn!
When I was a kid, I'd just hyperventilate then hold my breath to pass out. All it took, and I did it sitting down. Only a well trained free diver should consider taking more than 2 or 3 deep, quick breaths before descending on breath hold. I'm not qualified to explain the osmosis of shallow water blackout, but it's easy to find and read on.I keep thinking of that trick that kids would do by hyperventilating and then standing up and having someone place them in a bear hug and passing out. Same thing?