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Chris, How did you personally arrive at a plan max pPO2 of 1.4 ATA? Either there are data to show that diving at a pPO2 from 1.3 to 1.59 ATA is not safe or there are not. No way I am going to believe someone who says that they've always done ot that way before. In my business, that kind of talk often has preceded stupid mistakes that cost lives. I just don't want it to be mine. With air it wasn't an issue, most people never get to 186 fsw (1.4 ATA) let alone 218 fsw. But with nitrox, suddenly high pPO2s are now well within the reach of Joe Diver. If manufacturers or the dive community are not prepared to speak up then empiric evidence will win out - the equivalent of using the public as crash test dummies. I don't care if a few survivors/machos/foolish have been able to avoid an O2 hit - if 1.4 and above is dangerous, people will be injured and nitrox, diving and rebreathers will take the rap. Well that's my opinion. What's yours? Peter
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