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To: David
To: Story <story@be*.es*.sg*.co*>
Subject: Re: Computer deco
From: Richard Pyle <deepreef@bi*.bi*.ha*.or*>
Cc: Carl
Cc: G
Cc: Heinzl <heinzl@wi*.en*.de*.co*>
Cc: jheimann%scsd.dnet@gt*.co*
Cc: techdiver@opal.com
Date: Fri, 1 Apr 1994 12:54:59 +22305714 (HST)

On Fri, 1 Apr 1994, David Story wrote:

> Some of the most dangerous dives are those conducted in the 50-90fsw range.

YES!!!!  I share this perspective.  People have a tendency to forget that
risk involves much more than gas dissolution physics & physiology.  Things
like psychology have a way increasing probabilities of accidents.
But even from a purely decompression perspective, getting into
decompression time at 50-90fsw is probably much harder on your body than
getting into decompression time at 200fsw, assuming analagous &
comparable extensions beyond "NDL" (BTW, by NDL I mean a mathematical, not
a literal NDL).  On the deeper dives, ascent rate increasingly becomes the
most important factor.

> the Thorfinn's rule of doing very deep safety stops after deep dives:
> requiring a 1-2 minute stop at 60fsw is an excellent idea to avoid the
> massive overpressure deltas that traditional stairstep "pull"
> decompression models use.  

Again, I completely agree.  On deep dives, I usually hang out for a minute
or two down deep - much deeper than the first required stop. Also, as
mentioned, ascent rate becomes critical.

Just some thoughts.

Aloha,

Richard Pyle

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