17 DEAD END. This area marks the end of the channel. The water drops drains away downwards into a narrow conduit as the tunnel terminates. The walls in and around this area hold hundreds of pipes emptying water into the sewer. Each pipe is decorated like a slime-encrusted miniature gargoyle face, spitting out water.
At this point allow all party members to make a “hear noise” roll as if they were listening at a door. All who succeed will hear the sound of haunting music coming from the south.
The secret door is made to look like the stone. Manipulation of one of the gargoyle heads will activate it and it will slide into into the wall, revealing the secret passage to the south beyond.