Why Nitrox

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gt3073b:
According to this page (and others) He is only 23% narcotic relative to N2.
http://www.techdiver.ws/exotic_gases.shtml#2

At depth, helium causes problems other than narcosis.

http://en.wikipedia.org/wiki/High_pressure_nervous_syndrome

According to the Meyer-Overton Hypothesis the mechanism for narcosis is believed to be tied to fat solubility of the various gasses and interference with the lipids in nerves. Its not a coincidence that nitrous oxide is equally good in whipped cream and anesthesia.

Bryan.
Click to expand...

Yes, HPNS is a problem between 130 and 180 meters - This is usually dealt with by slowing down the decent. It is particularly a problem on Heliox mixes - The nitrogen in triox and trimix reduces the risk of HPNS affecting you.
 
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