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I had one of those it was great! Even after the self regulating BC control failed and I had to use it as a regular inflator it was still fun to dive. The CVS he was talking about was in the inflator he skipped over. It had a diaphragm that reacted to the ambient pressure by adding air as the diver descended and a purge valve on the right top side that vented air on ascend. Maintaining neutral buoyancy was done by the Nautilus not by the diver. The diver could of course at anytime operate the unit manually and over ride the unit. At the end of the dive the diver got out of water drained the water by opening the valve on the bottom left. Or if boat diving I'd vent the water with the inflator till it floated, take it off, complete the vent and leave it floating on end of a line.
A really well thought out and well built unit was ahead of it's time and something that some divers evidently need today!
The last I saw it was hanging on the wall in the classroom of the Giant Strides Dive Warwick RI. Red the owner decorates his store with vintage dive gear so I gave it to him for display.
I kept the 20lb lead bar I poured and used as "ballast" no weight belt, back mounted BCD.
I also have the manual for it. No pictures just text.