Mathias, you just notice it better when it is fast, as you would notice the
buzz if you dropped deep on air real fast. If you go slowly, the higher
order brain functions will tell you you are OK.

The impairment is there, but the recognition may not be. We found out about
the speed the way Manos did in deco switches to gas without helium ( we now
use helium ) and we found the impairment when we traveled one direction on a
narcotic gas, like nitrox, and then went to helium, but when we came back
the other way, we noticed mistakes in our bottle placement like they were
not turned off, or not clipped off, or the regs were hanging loose, and the
most frequent screwup ? We dropped them way deeper than they were supposed
to be breathed, adding to the screwups.

JJ and I actually thought somebody had fucked with our bottles until we got
shallow enough to think clearly and realize it was the gas. This ended the
nitrox bullshit a long time ago. Somebody needs to break the news to IANTD
now.

-----Original Message-----
From: Matthias Voss [mailto:mat.voss@t-*.de*]
Sent: Wednesday, July 04, 2001 1:50 AM
To: Manos Manoli
Cc: Tech Diver
Subject: Re: 33m Narcosis


Manos,
Trey is absolutely right with his tip.

When switching, you switched from 42 % Nitrigen to 64%.
It is not the absolute EAD which narced you , but the sudden change of
it.
You can get narced in about the same way when to hit the depth on air,
say go down in half a minute to 35 m.
So the less difference in pN2 after , the less narcosis.

Matthias



Manos Manoli schrieb:
>
> Something i got it sorted ,  and  i want  to share !!
>
> Ok last month i  dive a wreck on 65m for 35minutes.
> I used Trimix 18/40 , nitrox 36 , and O2 on 6m.
> After  a deep stop on 45m i moved on to33m where  i switched to ean36.
> Although 33m doesn't sound much as a narcotic depth after 2
> breaths my head started to spin like hell. I felt like being in a barrel
>
> rolling down a slope...i switched back to my bottom mix and stayed there
>
> for a while.  , i stayed a bit more and i switch again on my deco
> mix at 27m the barel stoped !. I have  learned my lesson...... I have  a
>
> friend who works in a lab , i had him checking my deco gas... levels of
> Co2
>  where acceptable..
> Trey suggested to add a bit of He on my deco mix and i did on the next
> similar
> dive i was  fine. I wonder what caused so much  narcosis at such a depth
> ?
> Could it be that i was tired all day long on board searching for that
> wreck ?
>
> So here im from now on i will switch on trimix 36/20 or better
> ill stay a bit more to my bottom mix and  switch to 50/50 on 22m..
>
> Manos Manoli
> www.smiley.cy.net/cytech
>
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