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Hi Adriaan

As a deep air diver I think I can add my thoughts to the 'last deep stop'
thread.

First I don't see any need for deep stops for such a reasonnable profile,
and in
general almost any air profile except the most extreme way beyond the
maximum PPO2 recommendations. A reasonnably slow ascent is perfectly
acceptable, and the difference in DCS risk is virtually nil if the
deco requirements are followed properly (the main difference is the deco
will probably be shorter). It won't make much difference in
fatigue either, air being much more 'deco-friendly' than helium, for which
deep stops have been created. It's not because your software offers that
option that it's wise to use it.

Second hovering at 6M seems to be problematic for some divers, the last
thing I would recommend in this case is the use of pure O2. Such a lack of
skill represents some risk on air, and a serious one on O2. I know only
strokes use 80%, but I think it would be much safer in this case,
although I would use 50% myself for more versatility, at the expense of some
more minutes underwater.

Third for such a profile plan your dive on whatever software you want, so
you know what to expect. Than dive whatever your Aladin Suunto Scubapro
Zeagle etc... tells you to, you won't get bent, except if you try hard to.
It's not DIR but easy and safe.

Fourth proper deep air training answers those questions, teaches how to
chose the last deco depth depending on the conditions, mow to respect
closely your
planned deco depth through the use of proper gear and procedures, etc... See
my point?

Regards.

Hugo.





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