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> George:
> 
> My understanding, admittedly based mostly upon publications of usually
> self-serving and at least somewhat inaccurate agencies and persons, has been
> that at subsaturation exposures between 130' - 200',  trimix has a higher
> deco "obligation" than air. 

 a comparison of published tables (such as Navy air vs. published trimix
> tables), private tables, empirical data, or what, and identify the source of
> the data.  I certainly can accept the possibility that the published tables
> contain errors, but if so, I sure would like to be able to get correct
> information.
----> 
 First of all, they are not comparable as they would not get used in the
same places . Look at this: the oxygen window is the true measure and
determinent of deco, and the total inert gas is the other measure ( this
is saying the same thing ), but high ppn2 will cause other problems that
deco will not solve ( when not in the presence of helium). For 21
heliox, 21 trimix, or 21 air, the deco should be the same , but it is
not. There are no accurate published tables or deco programs - you have
to combine methods ( bubble mechanics and a decay-type offgassing model
for tissues) to get the real deco. Commercial diving has good ones, but
then are secret. We have good ones, but they are temporarily secret (
until no other groups are competing with us for access to dive sites).
What I can tell you is that helium is your friend, not something to be
feared and loathed. If you cqan edo an air on air dive , which causes
amazing microcirculatory damge and that creates dcs by itself regardless
of deco, you can do a 21 trimix dive and deco on that gas as well. The
reason you do not think that way is because of the way it was originally
presented to you , and because you do not believe it.
--
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