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This reminds me of that scene in Babylon Berlin where a communist hides from the hit squad in the uhm tank of such a toilet.

Schindlers List has a scene sort of tile that too.

So does Vikings. And Slumdog Millionaire!

Yet there is no TV Tropes entry for that particular turn of events. Curious!

or

These are near misses. I also found some in my research, but nothing about hiding in the sewage tank.