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To George and all under his spell,
TYPICAL cave dives involve a greater deal of overhead to contend with =
during the ascent phase which lessens the PN2 of any given mix. Some =
caves however do not limit your vertical ability to ascend and most =
ocean dives do not either. I haven't been in a wreck yet that I =
couldn't go up from within 15 seconds. Remember that most of the Deep =
Air dives that you made with me were less than 30 minutes at a depth =
that averaged 20' shallower than planned. Despite the conservative =
approach to planning and the EAD of 130' within 30 seconds of ascent do =
you really feel that divers should not exceed a 130' EAD when going to =
180' or 190' because they may not poses the adaptive abilities that we =
acquired from continuous exposures to the same? I would love for every =
diver that wants to poke his nose a little deeper than 130' to take =
TRIMIX lessons, but for most the expenses would rule them out. The ratio =
of dives made on air in the OCEANS (from 130' to 190') to dives made in =
caves on air(from 130' to 190') are probably 10,000 : 1.... (IMHO) ...OK =
maybe 5,000 :1 Still using your accident report stats I'll bet that =
makes Ocean diving appear safer than Cave diving. I'll bet it will =
remain that way till were dead and gone. Seems all the funerals are for =
those who took air beyond our recommend limits. Lighten up on the issue =
and let's get incompetent on a mix at the bar. See you in the deco zone. =
=20
Sempre Deep,
Capt. Jim=20
-----Original Message-----
From: gmirvine@sa*.ne* [SMTP:gmirvine@sa*.ne*]
Sent: Wednesday, May 28, 1997 2:22 PM
To: TOM.MOUNT@wo*.at*.ne*
Cc: cavers@ge*.co*; techdiver@aquanaut.com
Subject: Standards, Deep Air, Narcotic Mixes - Three Wedings and a few =
Funerals
>=20
> ---Tom Mount <TOM.MOUNT@wo*.at*.ne*> wrote:
> >
> =20
> This
> > has produced a great safety record. >
> > Shaun you should stay witin your limits and if they are less than
> those
> > we advocate for trimix then by all means do not attempt to become a
> mix
> > diver with IANTD
> > Tom
> >
-------
Tom, I am incompetent on air at 160, so are you saying that I
could not get an IANTD "trimix" "certification"? Also, why not just
recommend 160 aed instead of 130? Why do you recommend less aed in cave
than ocean if you do not feel there is impairment?
If this is so safe, then why are a disproportionate number of
cave divng accidents amoung trained divers below 130 , and why are a
disproportionate number of ocean diving accidents below 130? =20
PADI long ago spotted the correllation without knowing why,
just like the Surgeon General spotted the link bewteen cirgaette smoking
and cancer, without knowing why. In 1997 the absolute reason was
established, and some day soon the absolute reason for narcosis will be
established. In the meantime, obvious is obvious, and the dichotomy in
your standards alone imply an awareness of this and a denial at the same
time.
The concept that there is such a thing as "ability to handle
impairment" is fundamentallly flawed. Your "standards" need changing, in
my opinion. - G
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