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Hi George, Sorry to not have answered you yesterday, but a friend of mine just brought down a Sartek HID light head for me and for two days I have been playing with it in Maya Blue and Dos Ojos. HID lights may be old hat to you guys in Florida but we're just starting to see them down here in the Yucatan. Wow, that thing gives off a bright light. And it really is blue/white instead of the yellowish halogen light I am used to. The caves look different when I can see further. And it will be real nice to not have my primary dull out near the end of the longer dives. As far as our deco discussion is concerned, I have been contemplating your words at great length and I think I am starting to see a little bit of light from the cenote at the end of the cave. Your statement <<Once up higher ( way up ) bubbling is not so bad a way to get rid of gas>> is one powerful concept. The idea that just maybe "micro" bubbles are not so tremendously bad when they occur at shallow depths, is really a revolutionary idea. Just maybe all bubbles are not created equal. And I imagine that you've probably been doing some Doppler work to convince yourself that the additional deep stops that you're using are indeed effective at reducing significantly the bubbling which might have occurred at the deeper levels. For me, one of the most exciting things in science is to recognize a new way of viewing a situation. And then to see where that new vision leads. And you just may be on to a little bit of that here. However I am still having a little bit of trouble understanding your statement <<but combine what I am saying to get your answer. On the other hand if you have made a high ppo2 gas switch deeper, then you can see how greatly this does in fact reduce the need for long shallow stops over an above the benefits discussed above.>> This seems to be similar to your statement in a previous posting <<we "SIT" on the 70 foot stop for quite a bit longer than is suggested by theory. The reason is we want to use that wide open oxygen window for all it is worth down there to both clear the slate as much as possible, and to move that ceiling again quite a bit so that we can abbreviate the stops above as their ppo2 declines, rather than lengthening them as either Bulhmann or bubble mechanics would indicate - real life says we are correct.>> I notice that in both of these statements you refer to a high PPO2 rather than a reduced PPN2 or PPHe. Am I reading something into your analysis that isn't there, or are you saying that the increased PPO2 itself is reducing the required length of the shallower stops? If you are saying this, then I would appreciate any further explanation you might offer on what is happening because (perhaps in displaying my own ignorance) it is not obvious to me immediately why this should occur. And you seem to indicate that this phenomenon is possibly as significant as the concept that "Not all bubbles are created equal." On the other hand, if it is indeed the reduction of PPN2 or PPHe that is important, then it is not clear to me why the Buhlmann model is not close to being valid. George, I am not in any way trying to bag you (I doubt that I could in any case). I am getting really interested in your techniques and I'd like to understand them more fully. My problem is that I need to convince myself intellectually before I can truly support any theory. Your reputation and accomplishments are reason enough for me to listen to you and study your arguments, but ultimately its your arguments and empirical results themselves that will convince me of the validity of your hypothesis. Because of this I really appreciate your taking the time to answer my (possibly simpleminded) questions. Thanks a lot. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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