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Has anyone resolved the fact that the Rule of Thirds is often (or seems to
be) inadequate for decompression diving?  I specifically refer to the
observation that in decompression diving, "going" from the starting point
to the turn-around point of a dive often (usually?) requires far less time
and gas than "returning" from the turn-around point to the starting point
of the dive (because of the decompression obligation).  This means, for
example, that if one of two identically breathing and kitted dive buddies
has a total gas failure at the turn-around point, then not both divers can
return safely to the starting point of the dive if they are diving the
Rule-of-Thirds!

Does anyone have a standard "fix" or "modification" for the Rule of Thirds
(in the context of decompression diving) that he/she uses?

Thanks in advance for your responses, and apologies if this has been
discussed earlier (I couldn't find a reference) in the Archives).

Ronald

P.S.  The only obvious way around this seeming inadequacy with the Rule of
Thirds that I can see is for me to complete a formal (and time-consuming)
gas-matching optimization computation using a set of obvious constraints.
I do this as a matter of course.  However, I was wondering if someone had
an approach that was more ad hoc (and much quicker) and less brute force
than mine.

P.P.S.  This problem plagues me whenever I begin planning for the
loss-of-deco-gas scenario while planning an accelerated deco air wreck
dive.
 

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