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John
>This is fairly simple. Take a cave(or an ohi) course and learn how
>to stage your tanks (cylinders) to the continueous guideline that you
>and your buddy should have pulled into the wreck.<G> Then the rule of
>3rds should be sufficent. If not try the rule of 4ths or 5ths.
This was not the scenario painted by the original post - try reading it
again. Of course point about the need for a guideline is correct. The rule
of thirds is primarily for bottom gas or people of a nervous disposition for
their deco gas. Halves (actually about 53%) reserves is appropriate for
deco gas. This allows for the failure of your buddies deco gas - you can
then share your gas with him.
As an aside, we also carry signaling devices to the boat to indicate a
problem underwater but do not rely on such signals being seen when planning
our dives.
> Sorry David but your starting to sound like one of though macho techie
>wreckie guys who dive the Doria doing only visual jumps.
I think you are confusing me with someone else. Suggest you take a little
more time to read what is written. Good job that I typed rather than wrote
in joined up writing.
David Shimell
Project Manager, Sequent Computer Systems Ltd., Sandton, South Africa.
Email: shimell@se*.co* <mailto:shimell@se*.co*>
-----Original Message-----
From: John Walker [SMTP:techdive@ea*.ne*]
Sent: Thursday, October 01, 1998 5:36 AM
To: David Shimell (shimell)
Cc: techdiver@aquanaut.com
Subject: Re: Rule of Thirds for Decompression Diving (LONG)
David Shimell (shimell) wrote:
>
> Ronald
>
> IMHO, in your scenario there have been two or three failures. Firstly,
the
> divers dropping deco stages (dropping *both* could count as 2 failures)
> followed by a back gas failure of one of the pair. If you need your deco
> gas to complete the dive then you must ensure that you can get back to it.
>
> David Shimell
> Project Manager, Sequent Computer Systems Ltd., Sandton, South Africa.
> Email: shimell@se*.co* <mailto:shimell@se*.co*>
>
> -----Original Message-----
> From: Ronald D Thompson [SMTP:rthomps@ma*.co*.mi*.ed*]
> Sent: Wednesday, September 30, 1998 1:06 AM
> To: techdiver@aquanaut.com
> Subject: Rule of Thirds for Decompression Diving (LONG)
>
> Thanks to all who responded to this thread.
>
> My original query which began this thread stemmed from my thinking about
> the following scenario: Each of a pair of air divers descends with two
> deco mixes, and removes both deco bottles and leaves them on a wreck at
> the point the buoy line ties into the wreck. The pair penetrates the
> wreck via an access point nearby. At the turn-around point deep inside
> the wreck, one buddy loses *all* of his/her backgas. Upon exiting the
> wreck, the now air-sharing buddies cannot locate their four deco bottles
> (or the buoy line). The buddies must now make a free ascent, blow a bag,
> and deco on one diver's remaining air.
>
> My original question was: How might the Rule of Thirds have been altered
> to allow both of these unfortunate divers to reach the surface safely?
>
This is fairly simple. Take a cave(or an ohi) course and learn how
to stage your tanks (cylinders) to the continueous guideline that you
and your buddy should have pulled into the wreck.<G> Then the rule of
3rds should be sufficent. If not try the rule of 4ths or 5ths.
Sorry David but your starting to sound like one of though macho techie
wreckie guys who dive the Doria doing only visual jumps.
Love, John
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