Alpha Labs - Sector 2: Union Aerospace Science Division


Doom 3 maps
Alpha Labs - Sector 2: Union Aerospace Science Division
Map name: game/alphalabs2

Alpha Labs - Sector 2: Union Aerospace Science Division is the sixth level of Doom 3. Trites first occur in this level soon after the first web sighting in the exit room. There is a glimpse of the Bravo Team through a window.


The marine continues the search for Bravo Team. Soon after entering Sector 2 of Alpha Labs, the marine encounters a broken door leading to a security checkpoint, and has to take detour through a rest room and vent shafts. Inside the security checkpoint the marine can use security cameras to take a look into various rooms which they will traverse through later. The marine then passes a few rooms and sees Bravo Team advancing through the facility. The marine is unable to reach them, but one of the team notices the marine and reports to Sergeant Kelly. Sergeant Kelly in turn tells the marine to go through engineering to Sector 3. On the way there, the marine passes the MFS compressor, one of the most significant UAC inventions. Eventually the marine finds Dr. Edwards, a scientist who offers to guide the marine through a very dark area (where the lights are off due to EMP activity) with the help of his lamp. However, at the end of journey Edwards is killed by an imp. In the final area the marine encounters dense webs and wrapped corpses hanging from the ceiling. Soon after, the marine is swarmed by the new enemy - trites. After fighting them while waiting for the maintenance ladder to lower the marine will find the exit to Sector 3.


Level 2 Entrance
Security Checkpoint Junction
Lavatory Ventilation Ducts
Engineering Security Checkpoint
Junction DO3 / DO4
Vista DO4 / DO5
Coolant Junction
Coolant Compressor Junction
MFS Compressor
Coolant Junction Hatchway
Hatchway HO2 / HO3
Storage and Engineering
Engineering and Coolant Control
Coolant Control Junction
Coolant Flow Control
Coolant Access Shaft 5
Lower MFS Control
Air Lock


Alpha Labs Sector 3.
Head through engineering and find the entrance to Alpha Labs Sector 3.



Video disks[edit]



The enemy count on Nightmare is the same as on Veteran. There are no changes in the enemy amount in the BFG Edition.

Enemy Recruit Marine Veteran
Zombie 5
Shotgun Z-Sec 2
Machine gun Z-Sec 4
Imp 13 15
Maggot 6 8
Trite 20 22


The item count on Nightmare is the same as on Veteran, except the med kits are absent.

* Contains bullets (48), shells (12), clip (120), grenades (6).

There are also two health stations on the level, both with 100 health in reserve.

Starting inventory[edit]

If the player starts the level via a console command, they will start with these items:

Item Amount
Flashlight 1
Shotgun 1
Machine gun 1
Shells (small) 1
Clip (large) 1
Grenades 1

Locker codes[edit]

For the sources of the codes, see Doom 3 locker codes.
  • Storage locker #038 - Ammunition: 409. Contains: security armor, hand grenades, ammo belt, clip (large).
  • Storage locker #039 - Storage: 102. Contains: security armor, clip (large) x2.


  • Upon entering the first set of vent shafts, the player receives transmission from someone trapped in storage room C4. In the upper floor of the Storage and Engineering room, the player can find a secret passage by hitting one of the floor tiles (the one that is marked by scratches). Inside the passage, the player receives another transmission from said survivor, but it's extremely muffled and distorted. If the player goes further the shaft, they will encounter an imp, some supplies, and a small room with very eerie voices, but no signs of the survivor.
  • There are many items hidden in the various corners of the dark area through which the player is lead by Dr. Edwards. A chaingun can be first found there, assuming the player hasn't got one from Martian Buddy box in the Administration.
  • In the MFS Compressor room, the player can access another vent shaft with supplies by clicking on a button a computer panel in that room, which lowers the ladder to the shaft.


  • On the original Xbox version of the game, the level is divided into two parts: Alpha Labs - Sector 2 East and Alpha Labs - Sector 2 West.
  • There is a trick that can be used in the room in which you are ambushed by a large number of trites. As you approach to activate the ladder, two trites will appear - one from a hole in the wall next to the ladder, and one from the floor. Kill the trite emerging from the hole in the wall, but not the one emerging from the floor. The rest of the trites will not attack until after this trite is dead, so you can keep retreating from this trite around the pillars until the ladder has extended; you can then climb the ladder and kill all of the trites in the lower area from above.
  • On the way through the crawlspace that leads to the first encounter with the trites, the player is given a hint of what is to come - a shadow of a trite is briefly seen in the crawlway. This shadow is caused by an actual trite nearby, which disappears before the player can reach it.
  • Though hard to do, it is possible to kill the imp that leaps down from the ladder before it lands on Dr. Edwards. However, even if you do, the scripting of his death sequence still plays out like normal.


External links[edit]

  • Walkthrough video by WoopzillaWalkthrough (part 1; part 2) on YouTube. Veteran difficulty; part of a full game run.