The single cavity could have been sold to the military for troop showers I heard.
Where the he11 did you hear that from? IF WDRP had a working single cavity why did't they bring it to the meet and greet to show it off? What they might have had was a bucket of water pumping some of it into a bench top hodge podge contraption at a very low flow for a very short period of time.
If they had the ability to sell, they should have sold, especially to the military.