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ClueAx17 karma

Two words: venting sans.

When the shitter's full, you've got to empty the sanitary tank. So you shut valves, hang signs in the heads (so nobody gets a turd geyser in their face), and use air pressure to push the crap to sea. Once empty, you have to depressurize the tank. The air that was just pushing poo gets vented back into the boat for your aromatic enjoyment.

If you were on a 637/688 and slept in the berthing just forward of the torpedo room, you knew exactly where the vent was. There were charcoal bags in front of the vent to reduce the smell, but their effectiveness depended on how fast funky air was being pushed through them.