How do you empty the black water tank on a submarine? Pressurize the tank and feed the fish. Then you have to vent the pressure to use the system again.
Via a charcoal cannister. Outboard of some poor schmuck's bunk in berthing. That, amigo, is asz.
Marine toilets have a big ball valve under the bowl. Before said operation, an A-ganger is supposed to make sure the signs are flipped in the heads. What happens when some poor shlub falls asleep on the can and the A-ganger doesn't look very carefully? Said schlub gets to clean the blast zone with kimwipes, Simple Green, then iodine. Then, he gets to clean himself.
