go through the doors on the right, then close them behind you and use your metal bar to keep them closed. head over to the levers, and flip the left one up and the other two down. go to the next room, then use the switch box to close this door. pick up the water hose and iron bar from the ground on the left, then combine the two and use them on the pipe to the sewers on the right to climb up.
head to the tunnel, then left, left and front left. pick up the wooden block. next go to the tunnel, front right and to the entrance. you 