When you walk out onto the surface quickly go to the door on the other side of the garage. Pick up the canisters just in case. When inside the room Kelly contacts you. Kill the zombie under the catwalk and then the solder zombie on top of the catwalk. Find some cover and wait for the two imps and a wraith to run into the room. Blast them all with your shotgun. After that get health on the shelf and armour under the catwalk. Now go to the next room. Take cover and kill the shotgun zombie behind a crate. Go down the stairs and pick up the armour. This will trigger two imps to appear. After killing them go farther under the catwalk till you get to a vent. Take a right in the vent to find shells and grenades. Pick up armour before you get to a zombie. After you kill it go down the ladder back to the surface.

Be fast. Take a right, a right, and a left then activate the elevator. Defend yourself from the Trites as the elevator gets ready. Then get in quick and go up. Once up the elevator kill the two zombies in front of you. To the right is some cells and armour; once you pick them up turn around and kill the imp in the opposite wall. Walk into the larger room and kill the imp on the catwalk behind you. Then climb the ladder and kill the zombie. When you pick up the supplies on the catwalk a cacodemon will appear. Once you kill that you can continue to the next room. In the next room make an immediate right and blow up the barrel next to the zombie then turn around and go under the garage door to get the necessities. When you progress further into the garage three cacodemons appear. Take good cover and kill them. Walk in the nearest door and you will see a PDA on the ground be ready to blast a chainsaw zombie before you pick it up. Once the first one is dead a second will come to you. Use the chainsaw dropped to kill the next one. Then use it again to kill the few other zombies outside the door. An imp will teleport to that area also. After everyone is dead look around the crates to pick up armour and health. Go into the next room.

In the right are of the hallway there is a fat zombie. For now on you can easily kill any zombie with the chainsaw unless it has a gun. In the same area grab the armour and grenades. A zombie will come too you from the hallway. There is a health kit n ext to the locked security door. Then go further down the hall. Kill the imp that appears when you get to the end of the hall a pinky demon spawns behind you which can easily be taken down with a chain gun or the plasma gun. Now the locked door is unlocked when inside kill the imp near you. Make a left and kill the second imp. Get the health in this room and then open the door in the north and kill the cacodemon. In this room it looks like hell broke loose (literally). Don't go on the red pit for it will hurt you. Collect the armour and health then continue.

At the top of the ladder be ready to kill the cacodemon. Once its dead activate the electronic panel near you. You will get a new objective. Go to the door in the south and kill the imp and the other two that appear. Get the med kit near the first imps location if you need it. Make a left and down the hallway. Pick up the armour shards as you do so. When you get to a room a pinky demon arrives; once you kill it get yourself the ammo and health in the room. Backtrack and go past the door you entered last. Go to the door to the upper PRC and be ready to kill an imp that jumps at you and then go to the next room. With the PDA on the ground you can call the lift to you. Use the panel right next to your location. When on the lift turn it left with the control panel (on the lift itself) and then move it forward. Turn it left again and forward again. This triggers a wall to the left to drop showing a machinegun zombie. Kill it and then pick up the supplies near it. On the lift again turn it right and then forward. Kill the cacodemon before it does some damage. Next keep going forward until your at the end. Turn it all the way around and then get off it. You are now at station 2.

Get the security armour and then an imp appears. Kill it and get on the lift again. Forward as far as you can go, right, forward, forward, and a right. Get off the lift and go up the stairs and into the door. Get the cells and health and leave. Go along the catwalk to the right of the lift track back to station 1. Be careful the track itself will hurt you a lot. At station 1 call the lift back to you (here we go again). Now make the lift move to station 3 which is mutilated. Below station 3 is some good supplies. Get them if you need them and go up the ladder to station 3 again and through the door. Shoot the zombie without a head and them pick up the ammo and shotgun. Then kill the imp that appears.

Go up the stairs and pick up the security armour on top of the crate. Go activate the nearby control panel and go through the doors back to station 2. Call the lift to you and when on it go forward as far as possible. Turn it around and rais it up. Go through the door. Go to the door at the end of the hall and kill the imp. Go across the bridge and go through the next door. Kill the shotgun zombie. When you go in turn around because an imp appears behind you. Go straight and into a room with a chainsaw zombie. Use your shotgun to kill it. Use the console to unlock the lift exit (you're almost done!).

Go back and make a left. At the end of the catwalk pick up the med kit and the cells and go near the next door. Be read to kill a pinky demon that runs towards you. Go through door and use the health station. Now go back to the lift and order it to move to station 3. Now the exit door is unlocked; go through. Pick up the armour and proceed forward. Doing so will lower the floor. Then pick um the Berserk item and start punching the zombies. After they are dead climb the stairs to Service Room 3. When the door open a chainsaw zombie attacks. After killing it open the airlock door. Go through the next airlock to the north or pick up items on the Mars surface if you need them. You can avoid the cacodemons easily if you want. Now you will proceed to Communications.