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Ian, Regarding EAD and END, I'm not sure which is better for which meaning. I've heard people use "END" for "equivalent nitrogen depth", for calculating decompression on nitrox, but I've mostly heard it used as "equivalent narcotic depth", as you suggested. The only reason I started using "EAD" instead of "END" is that I started this discussion early on with George Irving, who uses EAD, and I was just trying to be consistent with his usage. > mixtures at least, these would have been the same depth. However, I have > learnt over the last few days (Thanx Rich, John C et al) that O2 is also > narcotic, maybe even more so than N2. Don't trust my beliefs that O2 may cause *more* narcosis than N2 too much - so far I seem to be the only person who experiences this effect. It wouldn't be the first time that I am a freak. But if you notice patterns in your diving experience that support or refute the idea, I'd certainly like to hear about them! > Does anyone know how narcotic Helium is? I think it's safe to say that, for the depths that any of us will ever be doing ambient pressure diving to, Helium is not narcotic at all. Aloha, Rich Richard Pyle deepreef@bi*.bi*.ha*.or* ******************************************************************* "WHATEVER happens to you when you willingly go underwater is COMPLETELY and ENTIRELY your own responsibility! If you cannot accept this responsibility, stay out of the water!" *******************************************************************
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