These kond of rebreathing devices were developed during WW II by the “frog men” or UDT units; now called Seals. Gave out no bubbles so the divers couldn’t be easily detected. I’m sure they are far better now but then you can always stay under too lons or have a malfunction. 22 feet isn’t deep so nitrogen isn’t likely the problem.
These guys were in 225 feet of water. Would nitrogen be a problem that deep?
22 feet isn’t deep so nitrogen isn’t likely the problem.>>>>> i think it was 225