I trust that you're seeking permission from all of these people whose posts
you've been lifting from other lists?

Strike
----- Original Message -----
From: Lee Bell <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, October 09, 2001 11:01 PM
Subject: [SCUBA-SE] More on rebreathers - Australia


> I picked this up from Techdiver since it seems to refer to the issue
Strike
> raised about redundant rebreather technology in Australia.  If it's not
> worth more than what it cost,
> sorry.
>
> Lee
> -----------------------------------
>
> Hi everybody,
> I am new on the list. I am interested in  diving with rebreathers. I speak
> French so, my sincere apologies for my approximativ English.
> I red the website of Reinhard BUCHALY and Michael WALDBRENNER, and I would
> like to precise some points in this following message. The translation is
> good, because I gave it to a good Friend much better than me for
Shakespeare
> language...
>
> Some informations about the exploration of the Doux de Coly.
>
> Since 1984 the Doux de Coly is the longest known sump in Europe.
>
> Summary of explorations.
> 1972. PJ DEBRAS reaches 352 m (a remarkable performance at that time).
> 1981. Both Claude MAGNIN & Olivier ISLER dive one after the other and
MAGNIN
> stops at 1750 m.
> 1984. MAGNIN reaches 2630 m, and ISLER stops at 3100 m (up to this time
all
> dives are made with open circuits).
> 1991. ISLER stops at 4055 m using the RI 2000 (redundant rebreather with 3
> independant circuits).
> 1998. ISLER progresses another 250 m (to 4300 m) having unrolled 1150 m of
> guide-line, again using the RI 2000 rebreather.
> 2001. Reinhard BUCHALY and Michael WALDBRENNER reach a distance of 5000 m.
>
> At first, congratulations to Reinhard and Michael for their remarkable
dive.
> The Doux de Coly carries on and it is not the end. I am very happy to see
> that my difficult dive in 1998, where I found the continuation of the
cave,
> has so successful consequences.
>
> The dive of Reinhard and Michael is reported with a lot of details on the
> attractive website www.tekdyk/doux.
> Unfortunately, an error appears at the "Welcome" page of the site. The
> assertion that  "... all dives were directed using the DIR philosophy
> developped by the floridian cave diving team WKPP..." is NOT correct. In
> fact, the dive was directed using an intermediate philosophy between that
of
> DIR and the rebreather redundancy developped by myself (as mentioned on
the
> site).
>
> The analysis of their dive in fact shows that they both carried 2 X 20 l
> tanks on their back (return on open circuit in case of rebreather
failure).
> They dived as 2 divers together, as in DIR philosophy. Beyond a distance
of
> 800 m, no safety or relay cylinders were placed in the sump. The reason
was
> that both divers used the double rebreather RB 80. This is undeniably my
> philosophy of using Redundant Rebreathers.
>
> It looks evident that rebreather's redundancy, nevertheless thrown back by
> the WKPP, was decisive in their successful dive. If they had followed
exact
> DIR philosophy, Reinhard and Michael both would have used a single
> rebreather, and they would have relied on safety cylinders staged far down
> into the sump (maybe 3000 m or more), impossible to carry out without a
> powerful support team.
>
> As for myself, I am proud to note that, after 11 years of existence, my
> philosophy of Rebreather Redundancy, has begun  at least to appear in
> extreme diving activity. Even if it is not yet fully accepted, the idea of
> Rebreather redundancy goes on, in Europe with Reinhard and Michael and in
> Australia with David APPERLEY.
>
> I will end with a note that if Reinhard and Michael plan in the future to
> cross the stage of total Rebreather Redundancy (by using an additional
small
> front mounted safety rebreather) they will both have quadrupled
redundancy,
> when, during my own solo dives, I had at my disposal triple redundancy.
With
> such a configuration, the crash risk becomes tiny.
>
> Olivier ISLER