Monorail Skybridge: Facility Transport is the twelfth level of Doom 3. This is where trash is processed in the UAC. The player is supposed to simply cross the Skybridge to reach the Monorail, but in a stunning move, Betruger collapses the bridge, and thus the player must go through Recycling - Sector 1. The Revenant is introduced in a cutscene and this is the only level with toxic waste pools, in which the player has to fix a leaking pipe in order to move on in the level. The Rocket Launcher is found here.