This skit/routine goes on kind of long but it brings up the idea of selling infrastructure maintenance with, if not horror, ham fisted drama.
Cloverfield might have approaced the subject but that was kinda more along the lines of "leave it alone, man, who the fuck knows what's down there".
And then there's C.H.U.D. ...
Maybe this is a subject that needs to be sold with sex. Maybe with hot robot chicks in wet tank tops crawling around in the sewere. Might work.