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I have only been an avid ScubaBoard participant since 2004. I don't recall any during that period. Perhaps you could link to one.
That would be very surprising. Can you find a direct quotation?
It's been years since I read the book. I don't recall anything like that, but my memory is far from perfect. Perhaps you could find a quote on that for me? (I could try to contact Bernie to see if he remembers writing about it, but I really don't want to bother him.)
Yes, you can get down currents in Cozumel, but they are rarely as bad as people think, and I think the myth of the Scuba Mau situation years ago might still be influencing thinking. I do know of some serious whirlpool effects that people don't want to talk about that were quite powerful, but in most cases, down currents can be handled easily by a competent diver.I'm sorry if this was addressed in the last 9 pages but ... a friend was saying they choose not to dive nitrox in Cozumel because of the occasional down-current that can happen unpredictably and spit you out at 140 ft or so. If this were to happen, what is the most likely outcome - assuming I'm healthy, have at least half a tank of gas, and am able to get free of the down-current to do my safety stop (and deco obligation if I incur one)? Is this a guaranteed DCS hit? Are the symptoms and treatment similar to a DCS hit? We generally stay on top of the reef - occasionally go out to a wall, but not very often at all - so I'm thinking we aren't likely to hit a down-current but I could be wrong in my assessment and need to be prepared.
I picked this up from a website (liquisearch) but wanted to know if anyone has first or second-hand experience with oxygen toxicity.
"Divers trained to use nitrox may memorise the acronym VENTID-C or sometimes ConVENTID, (which stands for Vision (blurriness), Ears (ringing sound), Nausea, Twitching, Irritability, Dizziness, and Convulsions). However, evidence from non-fatal oxygen convulsions indicates that most convulsions are not preceded by any warning symptoms at all. Further, many of the suggested warning signs are also symptoms of nitrogen narcosis, and so may lead to misdiagnosis by a diver. A solution to either is to ascend to a shallower depth."
I'm sorry if this was addressed in the last 9 pages but ... a friend was saying they choose not to dive nitrox in Cozumel because of the occasional down-current that can happen unpredictably and spit you out at 140 ft or so. If this were to happen, what is the most likely outcome - assuming I'm healthy, have at least half a tank of gas, and am able to get free of the down-current to do my safety stop (and deco obligation if I incur one)? Is this a guaranteed DCS hit? Are the symptoms and treatment similar to a DCS hit? We generally stay on top of the reef - occasionally go out to a wall, but not very often at all - so I'm thinking we aren't likely to hit a down-current but I could be wrong in my assessment and need to be prepared.
Dry vs wet makes a differenceMr "Deep Stops",(Richard Pyle) was doing a Table 3 ride in a chamber, when the chamber operater became loudly insistant that he IMMEDIATELY stop breathing from the BIBS mask.
Because he was breathing pure oxygen at 6 Atmospheres and had been for some time.
High O2 levels won't kill you, but high O2 levels for long times will kill you without trained medical supervision.
As far as I remember the longest breathhold dive (O2 saturated with cramping at the start) was slightly over 27 minutes and the idiot that did it survived without any ill effects.
Michael