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One thing I was wondering. If you are going to all the trouble and
expense of using non-air mixes why use Nitrox at all instead of 
Trimix or Heliox?

It seems to me that you would get even more bottom time or greater 
dcs protection without the added risk of O2 toxicity by using those 
mixes instead of Nitrox.

Is Nitrox that much cheaper? Is special equipment needed for Trimix 
that is expensive?

Are there other hazards of Trimix use?

Does Trimix extend NDC time or do you just have to blow off the helium 
etc. instead of Nitrogen?

Rick Fincher
rnf@sp*.tb*.co*

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