Dean,

I believe it is the system used by S&R people when diving in *ZERO*
visibility where a SPG is useless.

-Phi

-----Original Message-----
From: Dean Laffan

Here's a snippet of the accompanying text:

> a very simple scuba system that consists of a twinset with manifold, one
first
> and one second stage and no contents gauge at all. They simply shut off
one
> cylinder pillar valve, then breathe off the other one until it is nearly
empty
> and they sense an increasing breathing resistance.
> That is when they reach behind them, open the previously closed pillar
valve
> and decant air from the full cylinder to the empty one. They then shut off
the
> "donor" cylinder again. This decanting process is carried out twice. Then,
> with 50 bars left in each cylinder (from an initial 200 bar fill), it is
time
> to head back to the surface.

What a shock to find I've been DIW.

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