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I hate to jump into these deiscussions since it likely makes no
difference what you do for these bounce dives, but it would be nice to
go over the correct logic for those who plan on progressing into more
serious activities. 

      First, identify the real risk - it ain't decompression, it is
oxygen. Oxygen exposures are cumulative without the proper intervals,
and as such are the true risk - death by drowning due to toxing.

      Plan your dives to reduce total oxygen exposure over the course of
a multi-day series of dives, not increase it. I realize this is not what
you were taught, but then look who's doing the teaching: people who have
never done this, never thought about it, never had to do it, and do not
have the capacity to find out or assimilate this information, asnd ha e
no access to the real information - good luck.





CHKBOONE@ao*.co* wrote:
> 
> Drew,
> 
>     If the conventional wisdom is correct in suggesting that one do the
> deepest dives of a series first then it is also suggesting that you take on
> the greatest N2 loading first.   But then there is the matter of time also.
>   If the second dive is considerably longer but only 10% shallower on Ean 36
> what have you then?   In reality this is too complex a physiological
> situation to reduce to a the presently available mathmatical models and
> expect it to represent anything as close to reality as all of us would like.
> 
>    I think I would follow the conventional wisdom and do the physiologicaly
> deeper dive first (greatest N2 exposure) on air simply because it has been
> shown to work by experience.  Then, when on EANx for the second dive you can
> extend your safety or deco stop and take advantage of the elevated O2
> available at the end of the days exposures.   You will probably have lots of
> surplus gas at the end of the second dive.
>    My thinking is that you actually have two air dives here (phisiologically)
> and this procedure leaves you with decompression and safety margin options
> that you can take advantage of during the last dive; especially useful in the
> event that things did not go as planned on either the first or second dive.
> 
>    I am assuming that this is a 'recreational limits' dive.
> 
> Chuck
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