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I saw a device on TV the other day that (at least for me) could do the job of
a rebreather.  They wanted to collect the exhaust gases from a diver using
open circuit SCUBA.  To do this the exhaust port ( and diaphram ) of the
regulator second stage was connected to a disk shaped object and then to 
the surface.  All exhaust gas was fed to the surface and none was discharged 
into the water!  I assume that the disk was some sort of depth compensated 
pressure reduction valve which allowed the exhaust gas to vent to 1 ata without
causing a regulator lock up or free flow ( 2 things I have experience in 
abundance while trying to create a similar device ).  Does anyone know what 
this device was, and where it can be obtained?

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