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>At 10:14 PM 7/31/95, Dan Volker wrote: > >>Talking about chambers in this scenario seems unrealistic. > >Dan - > >You miss the point. That's the way it's done. If you do it another way, >fine, but you're blazing new trail. Seems you might be increasing your >liability exposure by doing something outside standard practice. I agree that >this type of experience can be provided without a chamber, but it's a >new way of doing things. So was diving the Lusitainia w/o a chamber ... > >Regards, >Scott. Scott, Just to clarify, I did'nt do this, I dive deep alot, but don't teach. I know the instructor, and feel he's an asset to tech diving. I do see your point about accepted practices and the current legal environment. While I have made one 90 foot dive on the BMD, I have not gone for any specific tech training on it. IF I were to decide to do a 290 fsw exposure with it (first I'd probably pick a simpler one) I would begin very comprehensive training, because this really is nothing like scuba when a failure occurs. I would want to simulate every potential failure that could occur in the water, and before doing the actual deep dives with it I would have wanted to have perfectly handled all simulations in depths closer to a hundred feet. With the BMD,I don't beleive accidental hypoxia would not be possible due to a failure of the system, because you exhaust 25% of each breath, and if it stopped replenishing the desired mix, instead of rebreathing non-reoxygenated air, you'd drastically cut the volume in the counter lung with each breath. But this is not to say I would'nt be doing the pool session with skills and hypoxic symtoms. I think it would be a good exercise for familiarity, in the same way I believe any good diver should have practiced a free ascent from at least 90 feet somewhere back early in their scuba training. Its not because I would be likely to free ascend in an out of air emergency, as I would have a pony or doubles in most cases. Its a knowledge and performance kind of thing. And I think familiarity and learned reflexes are important to tech diving. The student in question was not interested in learning gas physics, or understanding the seriousness of using special mixtures and what their effect on his body would be. I think he learned a lesson from this, and having experienced difficulty in swimming, I think he realized his inability to learn the physics was not just something he could hide (having his buddy answer test questions for him), and that his lack of understanding may in fact effect his life. I think he decided the whole rebreather concept was too serious for him, and I think he was right. If you can't learn the math or the physical skills, you need to stick with the basic open water recreational diving, where floundering and lack of knowledge are the norm. Regards, Dan Dan Volker 407-683-3592
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