Lost in the Sewers: Part 1

After meeting with the Burgomeister Ewald O'Dula, he asks the party to follow the assassins into the sewers.
The Burgomeisters guards offer the party a torch each and gently push them into the sewers.
 
Following the first dingy corridor the party comes across rotten dilapidated door. Behind the door, lies a piles of broken boxes and furniture. The smell of urine is strong in this place. Another door lies on the opposite side of the room.
 
Passing through the second door the corridor comes to dead end with a left hand branch about half way along the left hand wall.
Nothing of interest is found at the dead end so the party moves along the left hand corridor, finding another rotten door.
Another dilapidated room filled with broken debris, with a left hand corridor and a door in the far right corner of the room.
 
Large rats burst out of the debris attacking the party.
 
Following the corridor leads to another door, to another room, with another door...