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Chris Hellas writes (in response to my question to him about a posting stating
that you should do additional deep EAN stops):

>      Even on DEEP trimix jumps it is not 'accepted' practice to do stops 
>of any description on mix with helium if it can be avoided. It is far 
>better physiologically to do any deep stops on air/Eanx and to 'force' a 
>deep stop over and above any mandatory stops reqd by the schedule you >are
running.

I'm not sure where you dive, so I don't know the accepted practice there. I
(and most people I know) use EAN32, 36, or even 50 for their travel gas, which
necessitates deep stops on trimix except for trivial exposures.  The tradeoff
is decompression efficiency on deep stops (better to use air or weak EAN)
versus deco efficiency on intermediate and shallow stops (better to use the
richest mix possible).  Since these stops dominate the decomression time, I
find it's usually better to use a relatively rich EAN mix.

John
HeimannJ@ma*.nd*.gt*.co*

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