To add to what John says, a couple of very simple and very obvious things to
remember are as follows:

*	Your primaries are on the right post (regulator and buoyancy (wing)).
*	Your backups are on the left post (regulator, buoyancy (dry suit)).
*	Avoid the stress by remembering how long it takes to dump a cylinder.

I mention the obvious since stress is a funny thing!!

The correct procedure is to isolate then shutdown.

The only time I've had a free flow underwater was a bit of a damp squib.  It
was on a stage whilst filling a lift bag in cold water.  A stage free flow is
really easy to continue breathing from via control of the value.

David Shimell
Email: shimell@se*.co* <mailto:shimell@se*.co*> 
Project Manager, IBM NUMA-Q, Sequent Computer Systems Limited,
Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK
registered in England and Wales under company number: 1999363, registered
office as above

-----Original Message-----
From:	John Brett [SMTP:JohnB@pi*.co*]
Sent:	Friday, January 07, 2000 11:51 AM
To:	Tech Diver
Subject:	RE: simple question

 
> What's the DIR on pressure gauges one or one on each 1stage for the
> bottom mix  ?

One pg, on left post.

> I know most people will say one but if this is the case ? How i guess
> from which tank
> im loosing the air ( in case of rapid air loss ) after the 
> isolation or
> do i follow the rule the needle doesn't drop
> that means the leak in on the other tank ?

You've worked the answer out yourself.
Of course, if you know where the leak is (e.g. freeflowing 2nd stage), you
can
shut the post down directly.

> What's the procedure during
> that crucial moments do i breath from
> the leaking tank ( if that's possible ) till runs out of air and then
> switch to the other ?

If you've done your gas planning properly, you shouldn't need to do this.
Switch to the working tank, and abort the dive.

> Or do i just isolate and
> take off the gear for a check out from the behind ?

This should not be necessary. Once you've isolated, you have enough gas
to abort irrespective of where the leak is. If your reg stops delivering
gas,
swap regs. If you've really screwed up and don't know what you're doing,
your buddy can look for the leak and shut it down. If you still can't sort
it out,
your buddy has enough gas to get you out. Plenty of options before you start
with kit removal.

John
ps: straight question + no attitude = straight answer.
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