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Dunno really........ thinking about it
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Why is devil gas so called?
As the great bringer of (shallow) benefits shouldn't we be more kind to the stuff?  
 

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ITYF it dates back to the time when the rufty-tufty techie divers were mixing their own mixes in their garages and yelling at all the recreational divers "Ha ha, two hours at 20m and no deco for me!"
Then the recreational divers said to their agencies "Hey, why won't you let US do that?" They had to have some excuse for not letting their members use gases other than air, so they talked loudly about the terrible dangers inherent in mixed gases. Oxygen fires, Oxygen toxicity, Oxygen hits… oh, it's dreadful stuff, you don't want to dive it, it's for maniacs.
Then they realised there was money in selling courses for it, and suddenly Nitrox was being peddled as "Safe Air" and that was that
 

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No Matt, it's just the wink wink gas that's known as Tri-mix. This is because Helium is piped to BOC from Satans arse itself. The reason the man down the stairs is so keen to do this is that it gets peoples souls down closer to him.

And that's the truth, honest.

Peter
 

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Yeah, it's Mix.
But if an agency is too scared to even contemplate Nitrox, it doesn't take much imagination to work out what they'll say about chucking in Helium as well...
 
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