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Higher is better - easier to breathe. Remember you are also trying to offset swelling and irritation. Also adding helium is preferable to adding nitrogen at that stage, since it is less lkely to conribute to bubble growth when you get out. I use the lowest oxygen that can be breathed at the depth with the highest helium. The term "air break" is generic for this action. Most people just don't get how to use oxygen - look at the usdct web site for how NOT to do it. My personal bet is that these strokes have french fried lungs after each dive based on the farm animility with which they are conducting the deco. The correct intervals are also far different from what these amateurs are doing. John E. Ivanic NACD#1648 wrote: > > I was just reading the latest edition of deep tech, and read the article > on the boy's that were diving in merimac cave system. > One of the fellows said he used 20/20 trimix for break gas, I was > wondering what the advantages or disadvantages are. I understand that a > lower O2% would be good, but what about the 20% He? > > John Ivanic comments: ivanic@di*.ne*
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