In this level you are required to use the teleporter a lot. Its weird that you don't go crazy like everybody else though. Start by walking forward and this will make a shotgun zombie attack followed by a commando followed by two machinegun zombies. Go through the next door into chamber 1 access. Pick up the security armour and the plasma cells in the northern area. Go through the door that lead to security station 1. Use the health station and use the nearby panel to open the last locked door. Go back outside and through the door you just unlocked. When you walk in a commando zombie will attack you. There are doors to the east and south in this room. Pick up the armour and go through the door near the armour you just picked up. When you go in you'll be attacked by a shotgun zombie and a commando zombie so be careful. When they are dead grab the supplies then leave the room and kill the imp that is crawling on the ceiling. Go through the eastern door to the terminal office.

When you go in the lights go out. An imp and two solder zombies start attacking you. Move around the room killing any enemies that appear and then pick up the shards in the northeast room. Look around til you find a desk with an ammo belt on it and a PDA. It says the code for locker #317 is 814. Go through the eastern door to the chamber 1 terminal. A commando zombie leaps at you from higher up. Another one is up there with a chain gun. If you don't mind using BFG ammo right now just use that to kill the chain gun zombie. Go through the door directly across the room. Use the health station and pick up the PDA. It tells you about a murder of a scientist team with a stolen BFG. Jeez even during these times of demonic invasions people still do this kind of crap. The cod for lockers #386 and #387 is 836. Touch the control panel to unlock a door in chamber 1 terminal. Go back there and go through it. Kill the commando zombie that attacks you. Before you are let to use the teleport you must be decontaminated.

When you go into the next room an imp and a commando zombie attack you. Go through the western door to T1 access. Type the code, 836, in the cabinets and get their supplies. Continue to the first teleport station. Kill the commando zombie hiding in the corner and the other chain gun zombie in the observation room. Go through the door that leads to the stairwell and pick up the ammo next to the corpse which triggers an imp to spawn. Go back to the teleport room and activate the teleport panel and make it teleport to Pad 2-Balcony. Walk into the beam and use the panel. Walk north to the door which leads to decontamination chamber 1 and a revenant will spawn. Pick up the large med kit near the door and proceed to the second decontamination. When your in the next room Betruger starts talking to you again. At the same time a commando zombie will attack you. Now go through the eastern door. Kill the machinegun zombie in there and find the security armour and plasma cells. Use the health station and kill the imp that spawns. When done go to the last room you were in and go through the other door.

Get the shells and the clip near the entrance and go through until you find some adrenaline and use the health station if you need it. Use the panel on the desk to unlock the door to the upper elevator access. Leave the office and kill the two commando zombies. One of them has a chain gun. Go through the western door way. You will be in the upper terminal office. Pick up the armour, plasma cells, and grenades. Next go through the northern door to the upper elevator access which is now unlocked. A machine gun zombie will shoot at you when you enter and an imp will appear near him. Go in there and get the security armour. Now go through the northern door. Go straight until you can turn right and kill the two imps that appear. Look around the hallway until you hear Betruger laugh and then kill the four imps that spawn. Go into an office in the southwest of the room and pick up the stuff. When you do a commando zombie will attack you. When you get all the stuff go through the hole in the ground in the northwest and crawl through it to chamber 23 terminal. There are a couple doors in this room so go through the door that takes you to Chamber 2 control and kill the commando zombie in the shadows. Pick up all the ammo and touch the panel. Leave that room and go into chamber 2 storage.

This room may be dark but don't worry for there are no demons in it. Pick up all the ammo, health, and armour pieces of the shelves before you leave. When done go to the room called teleport station 2. There is a revenant you need to kill in there. After him another one appears. Activate the nearby panel to start up the portal. Make it teleport to Pad 3-Storage. Now use the portal. Pick up all the supplies in this room and go out the door. Pick up the shells on the ground and go through the next door. A commando zombie will rush at you when you enter this next room so be ready. When you walk farther in a revenant and a chain gun zombie will appear. Take good cover and take them out with the rocket launcher or the plasma gun. Go into the kitchen area and kill the solder zombie. When you do this three imps appear as well as a chain gun zombie. Take good cover and equip your shotgun for this. When the fighting is done use the health station nearby. Next go through the southwest door into the hydrogen storage transfer.

Kill the imp that drops from the ceiling follo0w the catwalk your on til you get to a revenant. Kill it and go through chamber 3 access into chamber 3 terminal. Kill the imp that jumps at you and kill the second imp at the bottom of the stairs. Go through the hall to the west of the entrance and then take a left through the door to chamber 3 control access. Go down the ladder, kill the imp, and go through the door to chamber 3 control at the top of the stairs. Pick up the armour, grenades, and rockets in this room and use the panel to unlock the door to decontamination chamber 3. Use the health station also. When you leave kill the revenant that appears and go up the ladder and kill the imp waiting up there. Go into chamber 3 terminal and go into the door to decontamination chamber 3. When you enter the teleport chamber Betruger send demons to stop you (he's starting to get a little nervous). Kill the two commando zombies that attack you. Continue on. When you get near the teleport a revenant will appear. Kill it and the imp that follows. Order the teleport to go to Pad 4-Office. The office storage room is now open enter it and type 841 into the cabinet. Jump on the crates in the room and enter the vent. It will take you to the hydrogen transfer storage. Then backtrack to teleport station 3 and teleport to Pad 2-Security. Pick up the cells in the security room and the PDA which gives you access to leave this place. So leave the room and backtrack to teleportation station 3 and select Pad 1-Exit to teleport to. Right next to the pad is the airlock you need to open. Open it and press the panel to proceed to Delta Labs Sector 4.