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Sidney:

I'm not ignoring you. ;)

The impression I have of trimix/heliox is that the
helium is to keep you out of nitrogen narcosis and
there is no advantage for avoiding DCS.

At 50 feet, nitrogen narcosis wouldn't be an issue.

I've never done a dive with helium and have never even
run the numbers on a computer program, so I am at best
semi-clueless on this subject.

Since I really don't know the answer, I am going to
shut up and see if anyone here can educate us both.

TNX
Don

--- Sidney Brock Frederickson
<Bfrede1615@em*.ms*.co*> wrote:
>     That's why I was wondering whether He would be
> of any use in reducing
> nitogen loading and keeping o2 levels normoxic- or
> am I trying to make
> something simple complicated? Trey, Jim, anyone?
> 
>     Dive safe
>     Brock
> 
> 
>   ----- Original Message -----
>   From: Don Burke
>   To: techdiver@aquanaut.com
>   Sent: Saturday, June 03, 2000 6:19 PM
>   Subject: Re: Exposure 3h+
> 
> 
> 
>   I'm not very well versed in the use of helium at
> shallow depths.
> 
>   What are the advantages over, say, EAN 39?
> 
> 
>   Sidney Brock Frederickson wrote:
>   Peter:
>   This summer and Fall I'm planning some dives along
> the same lines with
>   the Oklahoma Historical Society and then as part
> of my cave training with
>   OCDA
>   I can tell you right off though that at those
> temps and durations you can
>   plan on some decompression time. Maybe not the
> massive times you've heard
> of
>   , but enough to warrant a smallish stage (30-40
> cf) bottle of O2. I trust
>   you are diving dry, staying well hydrated, and
> using a p-valve.
>   Even tho the depth seems shallow, the temp and
> duration make me think
>   that maybe helium would be a good idea here.
> Anyone care to comment?
>   In the meantime If you want send me some of your
> planned profiles and
>   I'll run them through Decoplanner and GAP.
>   Dive Safe
>   Brock Fredeickson
>   www.uwservicesllc.com
> 
> 
>   ----- Original Message -----
>   From: Peter Steinhoff
>   To: Techdiver
>   Sent: Wednesday, May 31, 2000 1:53 PM
>   Subject: Exposure 3h+
> 
>   What type of problems are you going to run into
> when you extend the
> running
>   time from 2 hours to 3-5 hours or so?
> 
>   I'm planning a "long" but very shallow (40-50ft)
> dive, 45-55F.
> 
>   --
>   Peter Steinhoff
>   DIR diver (trying...)
> 
> 
> 

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