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I am planning for an overnight deep wreck trip on which I plan to dive gas. 
Up to four dives are possible but I would like to bring no more than two sets
of doubles.  Air is available, but I don't have a Haskel or high pressure
storage bottles.

One plan I have considered is to fill both sets with  a relatively rich He
mix (e.g., 17/50) and use these for the first dives of the day.  I would then
top them off with air for repetetive dives.   This would yield something like
a 19% O2, 20-25% He mix (to be analyzed, of course), which is a little more
narcotic than I might like beyond 200 fsw but a lot better than air.  A
tables expert (Randy Bohrer) has told me that if I used the 17/50 repetetive
tables for this mix that I will fine, in fact quite conservative.  I can see
that O2 exposure might be an issue if I go beyond about 220 fsw, but
otherwise can anyone suggest flaws in the scheme?

jheimann@is*.wl*.gt*.co*

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