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Hello.

I do not dive mixed gases yet, but I look into
it and try to get some information first.
Just recently I had a conversation with a TDI
instructor and he told me they would use Nitrox
as travel gas then switch to air for travel and use
Trimix on the bottom. 
I just could not see the logic in that procedure.
One of the ideas in mixed gas diving is obviously
to get rid of nitrogen. So why would anybody
risk the high nitrogen hit when switching from
nitrox to air at depth. 
Why not switching to a apropriate He-mix ?
Maybe I missed a point ? Or is it just cheaper ?
As I said I have no experience in mixed gases,
so please do not flame me if I asked a stupid
question.

Thanks, Jens.



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