As far as narcosis goes, you are "reset" instantaneously as you switch the
gases.  The gas switch triggers a avalanche effect in the oxygen window and
nulls the narcosis mechanism.  After a period, the narcosis does reappear if
you are at a depth where it should occur.

This is a handy thing and will allow a small period of clear headedness if
used properly.  I don't know the travel mix and can't comment on the effect
on the diver for more than the short period of the gas switch.  Depending on
the workload, hypercapia may be a more suitable explanation because of the
increase in gas density.

The oxygen window "reset" for narcosis (incipient anesthesia) is known dive
physiology trait with myself as one of the authors of the article.

-----Original Message-----
From: Trey [mailto:trey@ne*.co*]
Sent: Tuesday, May 29, 2001 6:14 PM
To: Capt JT; Brian&Kari Hunter
Cc: Techdiver@Aquanaut.Com
Subject: RE: Trimix Computers



By the way, "travel" gases must be used carefully, and only where they fit:
it takes about two minutes for the effect of the last gas to wear off, so if
you are dropping, you are still "on" that mix well after you do not want to
be.

JT is right on the money with this bailout thing.

-----Original Message-----
From: Capt JT [mailto:captjt@mi*.co*]
Sent: Tuesday, May 29, 2001 7:36 AM
To: Brian&Kari Hunter
Cc: Techdiver@Aquanaut.Com
Subject: RE: Trimix Computers


Hi Brian
Let me explain why it is good NOT not to do this and why oldtimers think it
is Ok to do this.

First oldtimers use pony bottles as a bailout system with air mostly, with
the introduction of deep dives using trimix they believed that it was OK to
use the pony as a travel gas and for bailout. The whole pony bottle rig
takes years to master(if you ever really do) and is a sure sign you are
behind in the diving scene.

Ken Clayton, who uses the rig in the worst possible way, uses the pony as a
travel gas with air to around 200ft and deco or bailout gas. He also says
that you must do deep air to do these deep dives, to prepare for narcosis
on these deep dives. This is all untrue. I do not do deep air and dive just
as deep as he has with an EAD that is not = to deep air.

To dive with an high HE content and switch to a high narcotic mix will
knock your dick in the dirt. You will not be able to solve any problem and
have just created one.

Example, the first dive to the wreck "Ostfrisland" depth 380ft was done
with a heliox mix, there is no nitrogen in that mix, but the plan was to
switch to a nitrox mix for deco which has a high nitrogen content. What
happen to one of the divers was he nearly pass out from narcosis just after
the switch. All the first divers to that wreck were deep air divers and one
out of three had a problem of "Not handling it", I don't like those odds.

JT




   At 05:55 AM 5/29/01 -0400, Trey wrote:

>  Brian, first , stay away from anyone this stupid, and put his name on
here
>for all to see and avoid. Second, where does the air come from? Air is not
a
>natural hazard one comes across in diving. Only an idiot dives air.
>
>  There is no "handling" being fucked up on air. This is like thinking that
>if you put a hand over one eye, it is ok to drive drunk.
>
>  Really, in all seriousness, please give us the name of the piece of shit
>who told you this. It is hard to believe that anyone is still this stupid
>out there.
>
>-----Original Message-----
>From: Brian&Kari Hunter [mailto:sasha@ka*.ne*]
>Sent: Tuesday, May 29, 2001 12:35 AM
>To: Trey
>Subject: Re: Trimix Computers
>
>
>Trey,
>Should a person know how to deal with narcosis so if they have to switch
>from he to a more narcotic for emergency reasons they know how to handel
it?
>The instructor i'm thinking of taking trimix with says this is true after I
>told him I wanted trimix to stay away from deep air.
>
>
>----- Original Message -----
>From: Trey <trey@ne*.co*>
>To: <ScottBonis@ao*.co*>; <techdiver@aquanaut.com>
>Sent: Friday, May 25, 2001 6:14 AM
>Subject: RE: Trimix Computers
>
>
> >
> > Scott ,the legacy of Gilliam and Mount lies in the  holding of deep air
> > diving records ( Tom was one of the "pioneers" there ) and the rest of
>their
> > "accomplishments" are not material for this list. Let's say they did not
> > know any better and  so what. The thing that bothers Cobb and the rest
of
>us
> > is the ongoing inability and unwillingness to move onward and upward
with
> > the learning curve.
> >
> > Using their "position" of "respect" to misdirect is not now a worthy
> > endeavor. Failing to learn is not worthy of respect. I could go on, but
in
> > truth some of these guys need a good kick in the balls, and maybe their
> > hearts and minds will follow.
> >
> > I do not need respect or protection: I can argue my case successfully
and
> > they can not, because they have no case - ever. I am sick of hearing
about
> > the latest gimmick that Tom thinks is so clever that he just started
using
> > yesterday but is perfectly willing to recommend it to anyone, and as Jim
> > Cobb very accurately said, Tom has a long history of this going back to
> > square lights and so forth.
> >
> > If there is anything that I tell anyone that turns out to be bs, then
> > somebody come on hear and point it out - won't happen, and if I do
>something
> > which later proves to be superceded by a better way, I am the first to
say
> > so.
> >
> > The cumulative track record of IANTD and TDI is not something that
>commands
> > any respect at all, in fact, it should require jail time in my opinion,
>and
> > if you want a cross section of real nonsense, notice the misinformed
>baloney
> > that comes out of some of these "instructors" when they post to this
list.
> >
> > -----Original Message-----
> > From: ScottBonis@ao*.co* [mailto:ScottBonis@ao*.co*]
> > Sent: Thursday, May 24, 2001 5:22 PM
> > To: techdiver@aquanaut.com
> > Subject: Re: Trimix Computers
> >
> >
> > Hi Jim,
> >
> > You may recall that you and I have butted heads a number of times in the
> > past, as well as agreeing on various subjects also.  But I see another
>head
> > butting coming on.
> >
> > I have on numerous occasions chastised posters on the net for saying
> > derogatory things about Trey.  Not ever for arguing about his opinions
or
> > advice (which are usually pretty sound), but for showing a lack of
respect
> > for his accomplishments and dedication to the sport of diving.  There
>comes
> > a
> > point that even if I disagree with what is being said, I must respect
the
> > speaker if he has earned a certain position in the community.  A
freshman
> > doesn't challenge a full professor.  He or she may question, but never
> > accuse
> > or direct.  After the freshman has graduated and contributed to the
> > community, then he or she may argue.
> >
> > Now I must request that you display a greater respect for several of the
> > people in the dive community who don't happen to be associated with the
>WKPP
> > or GUE.  Tom Mount, whether or not you agree with his dive techniques,
is
> > one
> > of the clear leaders and outstanding figures in the technical diving
> > community.  He at IANTD, along with Ed Betts at ANDI, Bret Gilliam at
TDI,
> > et. al. for example, are, whether or not you choose to accept it, among
>the
> > true pioneers in technical diving.  These people and others like them,
are
> > our teachers and have devoted major portions of their lives to advancing
> > diving techniques and making the sport safer for all of us.
> >
> > Perhaps you now feel that some of the information being presented by
these
> > organizations has been superseded by new data that points in a new
> > direction.
> >  This may be so.  But it does not give you the right or even simply
> > permission, to forget that these people and organizations have
persevered
> > and
> > should have earned your respect.
> >
> > Trey, by virtue of his unique position as a nonprofessional whose
> > accomplishments, experience and contributions to the body of technical
> > diving
> > knowledge have earned him the respect of divers worldwide, happens to
have
>a
> > confrontational communication style.  Because of his position I, and
most
> > others who wish to learn, overlook this as a personal negative.  It is
his
> > way and we accept him for what he is and what he has to offer.  And we
are
> > appreciative for his time and efforts.
> >
> > But make no mistake that you have certainly not earned a similar
position.
> > In my opinion, you have no business whatever telling Tom Mount or the
> > others,
> > what they SHOULD be doing.  They are the teachers and you are the
student.
> > They tell you.  You listen quietly, ask for more information, choose
what
>is
> > right for you and make your own decisions.  But you do not pretend to be
>on
> > the level of your teachers and direct them.  That is pure ego.
> >
> > Let's not forget that we live in an ordered society where true respect
is
> > earned over many years of accomplishment and service, not simply by who
>can
> > yell the loudest or type the most curse words into his or her computer.
I
> > consider myself really fortunate to have had the opportunity to learn
from
> > individuals of this caliber.
> >
> > Jim, I think that you ought to consider this carefully and perhaps
modify
> > your approach when communicating with these folks.  And I need to say
here
> > that although this message is addressed to you Jim, I am actually also
> > speaking to a number of the other posters on this list.
> >
> > But then OTOH, this is simply one diver's opinion.
> >
> > Take care and dive safe,       Scott
> >
> > Some weeks it's just not worth the effort to gnaw through the restraints
>and
> > scramble up out of the pit.
> >
> >
> >
> > In a message dated 5/23/01 9:12:32 PM, cobber@ci*.co* writes:
> > << Tom-
> > Maybe not but there are plenty of diveshops out there who would
> > love to sell some of these high margin pieces of shit and saying what
you
> > said below is about as close to a promotion as you can get. Did you
>purchase
> > yours or was it a promo?
> > <snip>
> > Tom, as I recall you used to stuff the long hose, use bungee wings, use
> > steel stages, dive deep air, etc. Don't make this mistake too. >>
> > --
> > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
> >
> > --
> > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
> >
>
>--
>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

"You can't learn to dive on the net, sooner or later you have to get in the
water"
Your Guide to Great Wreck Diving along the East Coast & more
  Web Site  http://www.capt-jt.com/
Email     captjt@mi*.co*


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