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Date: Tue, 07 Oct 1997 09:40:48 -0400
From: "George M. Irvine III" <gmirvine@sa*.ne*>
Organization: Woodville Karst Plain Project
To: EE Atikkan <atikkan@ix*.ne*.co*>
CC: cavers@ge*.co*, techdiver@AQUANAUT.COM
Subject: Re: Deep Air - still need to look @ facts
Essssssssat - let's use an "anal"ogy that you can relate to : death from
HIV. Is it the cancer or other diesase that killed the patient, or the
pail shots he took in the first place? High risk behavior begets
predictable results. I only need to know one thing about aids - don't
take a pail shot. Same about deep air - don't do it.



EE Atikkan wrote:
> 
> It is disturbing to see that the antagonism for 'deep air' has led to
> listing accidents without a clear cut understanding of the contributory
> factors.
> 
> Furthermore, this his has been done without a clear definition of
> 'Deep', or the depth mediated 'causal effect' that contributed to the
> demise.  Which negative effect of air at depth are we concrened about?
> 
> Ox tox - regarded as a primary contributor.
> Narcosis - an impairing factor that becomes an issue when 'things go
> wrong'.  That brings about the question would the victim have survived
> if they were not on air, thus less narked.
> Other physiological factors - remain relatively undefined.
> 
> In an analysis, accident or whatever, parameters must be defined &
> causal as well as contibutory factors must be identified.
> 
> I questioned the validity of including dives in the 140-160 range in
> the 'deep air deaths' list.
> 
> I still do & will continue to do so.
> 
> Was it narcosis?
> Was it ox tox?
> Were there other medical, physical, mental, psychological factors
> involved?
> 
> It is well etablished that using depth as the osole criterion is
> inadequate.  Many a shallow dive can be significantly more complex than
> deeper ones.  I am sure the cave diving community is well aware of
> that.  Most wreck diver are, as are ice divers.
> 
> Until supplemental details of accidents ascribed to deep air are
> provided, the arguments against deep air, in particular in the 140-160
> range, will ring hollow.
> 
> Many dives take place in the 140-160, even 170 range.  The NAtl wreck
> diving community dives it routinely.  In Europe 165 has been the limit
> for recreational diving.  All on air.  Do accidents occur?  Yes.  Was
> air @ that the contributory factor?  Possibly.  Could other factors
> have been causal?  Most definitely.
> 
> Also having 1st hand info with one of those accidents ascribed to deep
> air I can tell U that:
> 
> Ed Suarez was not on air - it is thought that he toxed because he
> switched to the wrong mix or that his mix was unsuiatable.
> 
> Esat Atikkan
> 
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