You start the level by walking across a bridge that collapses. So quickly follow the path to the south to the next airlock. If you need oxygen you will see one if you go on the path to the airlock. When your inside the airlock get out your chain gun or plasma gun for a pinky will charge you. You can kill it easily if you just shoot at it while sprinting backwards. Around the corner is a maggot and a zombie on the right. There are shards and shells in the area where the zombie came from. Go to the halls end in the east and you will see a zombie hanging from the ceiling. Once you go near a fat zombie will attack you out of the shadows so be ready. Behind you has spawned a maggot which can be killed in a jiffy. Get the health and clips at the end of the hall and go through the door.

Say hello to the Revenant. For your first time these things can be tough. After the cut scene take out the plasma gun. Since his rockets are heat seeking you need to shoot them down with your plasma. Also dodge them but make sure that you are shooting HIM to. After he's dead go on top of the catwalk where he was and kill the second revenant in the same way. Walk up the ramp that comes from the southern wall and kill the imp up top and get some goodies (cells, chain gun, shells, large med kit, and clips). Now go through the next door

When you go in be ready to kill a pinky demon before it charges you. After that kill the fat zombie lurking in the shadows. Pick up the adrenaline and shell from where the zombie was standing and go through the next door. In this room kill the imp in the corner and take the clips and cells near him. Go through the door in the north. In this room a maggot and two imps teleport to you. Kill them up close with your shotgun. Pick up the clips and armour in this room and ride the lift down.

When you get down the lift two maggots will charge you. To the right of the lift is a med kit and some shells to pick up. Go down the hall, get the cells, and kill the maggot that attacks you. When at the intersection a revenant will appear in front of you and to your right. Kill them with your plasma gun again. Continue down the hallway near the plasma cell. At the end of the hall get the armour and turn right to pick up more stuff. Shoot the imp on the other side of the door when it opens walk further and kill the pinky demon that runs at you. Then another come to you. After doing that run to the north end and kill the third pinky demon when it gets summoned. Go through the western hall way and kill the maggot that is behind you.

The hallway leads to the pump room. Kill the fat zombie in there and get the shards behind him. Two more come out from hiding in the shadows. Also an imp hides behind the shelf with supplies on it. Kill it and pick up the cells behind it. Stay on the west side of the room so you can see when a zombie comes near. When they are all dead walk up the stairs onto the catwalk. Kill the imp that awaits you at the top. There is a pipe to the right that you can walk on that has some security armour on it. Get it without falling. Further on the catwalk a maggot will attack you and there will be an alcove on the right. Quickly throw a grenade or two in there because in there hides a revenant.

When you go through the next door be prepared to kill the imp to your left and the revenant at the top of the broken stairs. Now go to your left and out the door and you will see toxic waste. On the other side of the door is a maggot. You need to shut down the broken pump so make a right and jump on the broken catwalk. Now walk through the room and kill the imp. After its dead another will attack from around the corner. Pick up the ammo belt in the area the first imp jumped out of and continue. There is a shelf you will see with and imp hiding behind it. Pick up the health and ammo on the shelf. A maggot will soon charge you. There is armour behind some barrels; make sure you don't blow yourself up. Go up the next stairs and pick up the med kit near the top. Throw a grenade towards the door to send the hiding imp a nice tasty surprise :( . Through the next door kill the imp to the left and then pick up the PDA. The code to the locker you will see is 483. Use the health station and then activate the ladder panel. Go up. Kill the two imps you run in to. Next jump over the railing onto a thick pipe and walk to the catwalk on the other side. Be careful not to fall. When your about half way there a cacodemon will spawn. Kill it without falling. When on the other side touch the panel in the middle. Go to the nearby shelf and pick up the goodies. And proceed until you get back to the ladder. Now you will end up on the broken stairs where the revenant was: kill the imp that spawns. Get back to the room with all the toxic waste. Don't worry, you can walk on it now. Go to the other end and jump up the the catwalk. Kill the imp that is to the right and go up the stairs into the next room.

Shoot the barrel next to the imp at the other side of the room. To the right of the entrance there is a med kit, a chain gun, and some ammo belts. Use the chain gun ammo you just got to kill the six imps that spawn. After you have done that climb the nearby ladder. A large med kit is near the entrance. Use it after you kill the two pinky demons deeper in the place. Look around for the clips, cells, and the health station. Go through the south door. Moving through this tunnel should be fast. kill the trites as they come down from the ceiling and the imp at the end of the hallway. Get the ammo on the ground and go to the waste disposal room. Kill the revenant across the room and walk along the path way to the rooms end. When you get to the door a revenant appears so kill it and the imp behind you.

In this room kill the maggot hiding in the corner. Pick up the med kit and the PDA. It will talk about rocket launcher testing. Go further into the room to find the launcher on a rack. Kill the maggot around the corner and the imp above you. In the shadowed are you will find armour, shells, and rockets. Go through the airlock.

As you are running on the surface pick up the air canisters as you go. Go to the wrecked little room and get the supplies and then jump on top of the wreckage and up to the top. Kill the revenant standing up there. kill the cacodemon that appears also. Pick up the air canister at the end of the catwalk and go through the airlock to proceed to Recycling Center 2.