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John Heimann writes: > >Dave Giddy writes: > >>... >>My primary suggestion is that in the range of 50-80m (160'-260'), something >>like Nitrox-10 or even Nitrox-5 may be a safer breathing gas than air. >>... > >Why would 5-10% O2 Nitrox be safer than 16-18% O2 Nitrox (PP02=1.4-1.6 ATA at >80m, the deepest depth in your range)? The basic nitrox rule of using the max >FO2 possible within CNS tox constraints still applies here. EAN16-18 has >acceptible PPO2s as depth, and much friendlier decompression (which I consider >to be "safer") than EAN5-10. Moreover, EAN16-18 can be breathed at the >surface, which EAN5 or EAN10 cannot be. Yes, point taken. EAN16-18 would probably be the best coice in this depth range. The fundamental point I am driving at is the use of lower than normoxic nitrox mixtures to increase safety for dives which are often done on air. Is this something people have done or is it an area which techdivers should start exploring ? Cheers, David. ______________________________________________________________________________ David Giddy, | Voice: +61 3 253 6388 Telstra Corporation, | Fax: +61 3 253 6144 P.O. Box 249, Rosebank MDC, 3169, AUSTRALIA | Internet: d.giddy@tr*.oz*.au* ------------------------------------------------------------------------------
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