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Let me just say here, that use of less than 35% helium is limited to dives of
less than 100'.  Anything over that requires at least 35% to be meaningful for
decompression, and for narcosis.

Jan

In a message dated 7/17/2003 5:14:52 PM Eastern Standard Time, Jsuw writes:

> I did goof here when I mentioned 35% helium as a minimum.  I use 30/30 trimix
for recreational depth dives, and I do feel the advantage of the 30% helium
even on these kinds of dives.  I am definitely less narced, and I feel less
decompression stress than when I dived air or nitrox in the past.
> 
> Narcosis is insidious; its early effects are subtle and occur shallower than
you'd imagine.  I doubt you are completely aware of when you are narced. 
Expect that you are at least mildly narced even at 30'.
> 
> The mixes I use are 30/30 or 18/45 for most of my dives.  Note that the 45%
helium is slightly higher than the WKPP minimim helium content for 190' gas,
but it matches the GUE 
> standard mix.  I feel better with more helium.
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