It sounds like you’re referring to the 2006 DreamWorks animated film . The “city” in question is Ratropolis , the bustling underground sewer city where most of the movie takes place.

Verified | Flushed Away City

It sounds like you’re referring to the 2006 DreamWorks animated film . The “city” in question is Ratropolis , the bustling underground sewer city where most of the movie takes place.