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Alpha Labs - Sector 3: Union Aerospace Science Division

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Doom 3 maps

Alpha Labs - Sector 3: Union Aerospace Science Division is the seventh level of Doom 3. It contains a very hidden plasma gun and an optional chaingun. All the locker codes are the same, due to the incompetence of the employees.




Monster Count
Imp 8/8/11
Maggot 7
Pinky demon 2/2/3
Trite 19/19/24
Zombie 7
Machinegun Z-Sec 5/5/6
Pistol Z-Sec 4/4/5
Shotgun Z-Sec 7/7/10
Weapon Count
Machine Gun 1
Chaingun 1
Plasma gun 1
Ammunition Count
Pistol ammo (large) 2
Shotgun shells (small) 4
Machine Gun ammo (small) 7/7/6
Machine Gun ammo (large) 4/4/3
Chaingun belt 4/4/3
Plasma cells (small) 1
Plasma cells (large) 1
Misc. items Count
Small medkit 5/5/4
Large medkit 8/8/7
Armor shard 21/21/24
Security armor 5/5/4
  • For cells of the form x/y/z, x corresponds to Recruit difficulty, y to Marine, and z to Veteran/Nightmare.
  • Items that can only be acquired by using console commands are excluded.

Cabinet Codes

  • Storage Cabinet #047: Ammunition - 123
  • Storage Cabinet #048: Ammunition - 123
  • Storage Cabinet #049: Ammunition - 123


  • To get the hidden Plasma Gun, the player needs to open "Ventilation Access Grate 3" through a touch-screen, located in a L-shaped console, on the right just after accessing a standard door (before the room with a lift). After opening the access grate, the player must come back through the door he just entered and immediately turn left; he should see some boxes and the ventilation access opened. First item in the ventilation duct is a medkit, then following the little conduit, the player must turn right, watching a room through a grate: shoot it (one shotgun shell should do the job) and the Plasma Gun is just ahead, on the pipes; then he can follow the pipes-road on the left to find other useful stuff, like armor shards.

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