Sewer Room

The Sewer Room is (or was) Ratman's hideout. You can access it by going through the city park, to the bathroom, into the open drain, get pass the sewer entrance puzzle, into the door and Pronto, you're in.

History
After the meteor crash and the bank robbery, Ratman hid here, eventually he was found by the Hero, knocked out by sewage, and brought to justice (see Ratman for details).