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From: "Scott" <scottk@hc*.co*>
To: "Techdiver" <techdiver@aquanaut.com>
Subject: Re: "Helium willies"
Date: Mon, 15 Nov 1999 08:39:06 -0800
> The "willies" is bullshit - reality it what is scary, and helium gives
> you just that - too much reality. Anyone who is doing ridiculous diving
> or chamber experiments SHOULD be concerned - very concerned.
> Anesthesizing them with nitrogen is not the answer.

Affirmative! Ron said the nervousness was because your body and mind *knew*
it was not supposed to be operating under these parameters. He also said
that HPNS was really affected by the rate of compression. That, after a
couple days at 850, they would smooth out a bunch. On the rapid drops they
did, HPNS was so bad that doing anything usefull after hitting the bottom
was out of the question. "You couldnt even hold a cup of coffee."
(important if you're a swabbie!)   =;-)

> Helium and heliox require shorter , not longer decompressions. What the
> real story is that the "air" tables are all wrong, and should be longer
> than trimix ( all things being equal ) and in fact air should require
> the deeper stops that helium seems to ask for in the current "models" in
> use. The misconcpetion is then that high helium needs more deco. The
> more I have, the less I do.

So, if I get all this correctly, there are no accurate Air, He02 or trimix
tables, born out by the *fact* your
guys are still ambulatory and here to post.

Now, we all understand that you *do not* represent the typical diver.

So, with that in mind, how do *we* mortals generate safe, accurate and
reasonable
He02 tables?

> Ask our deco geeks what they have obvserved with me, Mee, Trout, Rose,
> JJ, Werner etc. for confirmation of this, and this is born out by
> doppler and blood tests, not supposition and bullshit.

Any of you deco geeks reading this?

> As for Jablonski's choice of gas for the Britannic or any other dive, it
> is a function of the availability of a booster pump only.

<snip>

Understood. This is/was the basic reason for trimix in the first place, as I
understand it.
02, He, HP air to top.

<snip>

> Scott, it is real simple: 1) you need to be as clear as possible when
> diving - heliox gets that done, 2) you need a fast gas that does no
> damage of its own ( as nitrogen does ) and is actually inert - that is
> helium, and 3) you need to have no preconditions ) inluding excess
> adipose tissue ), you need good vacularization and perfusion ( i.e. good
> genetics), you need to be in good cardiovascular condition, and you need
> to be free of any injury or damage prior to diving, and you need to have
> no pulmonary reactions to these stresses, no blockage or swelling of any
> gas spaces, and you need to be armed with real information, not drooling
> bullshit like this "helium willes" nonsense.

Can we use the  Buhlmann tables/algorithm for He02 or should we be looking
elsewhere?

The Navy tables also call out longer deco on He02. *That* doesn't make
sense.

Scott



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