Delta Labs - Level 4: Union Aerospace Research Division


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Doom 3 maps
Delta Labs - Level 4: Union Aerospace Research Division
Map name: game/delta4
"Your Hell awaits!"
― Malcolm Betruger [source]

Delta Labs - Level 4: Union Aerospace Research Division is the nineteenth level of Doom 3. The player reaches the most damaged site of the base, where the invasion ultimately started. Hell knights are introduced in the cutscene.


Spoiler Warning: Plot details follow.

The level begins with Betruger taunting the marine, gloating that the Soul Cube is in Hell and will never be found. The marine enters Delta Level 4, and finds bloody skeletons littering the hallways. Worse, demoralizing messages have been written on the walls in blood.

The marine finds the Main Portal in Delta, encountering only a couple of chainsaw zombies along the way. Betruger is waiting in the control room above. He activates the portal and summons a pair of Hell knights who are chasing a scientist in a biohazard suit. The knights kill the scientist and then turn their attention to the marine.

The marine battles and kills both knights. However, the portal's energies expand and suck the marine into it, transporting him to Hell.

Spoilers end here.


Air Lock
Delta 4 Junction 1
Delta 4 Junction 2
Delta 4 Security Check-In
Delta 4 Main Ready Room
Delta 4 Security
Delta 4 Transference Lab 001



  • Jack Gilbert. Found in Delta4 Junction 2, near a locked door in a pile of skeletons.



This map has the same enemy count on all skill levels. There are no differences in BFG Edition.

Monster Amount
Chainsaw zombie 2
Hell knight* 2

* Both Hell knights have 1400 health instead of the regular 900.


This map has the same item count on all skill levels. There are no differences in BFG Edition.

Item Amount
Ammo belt 1
Rockets (small) 1
Security armor 1

There is also one health station on the level, with 100 health.

Starting inventory[edit]

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

Item Amount
Shotgun 1
Machine gun 1
Chain gun 1
Plasma gun 1
Rocket launcher 1
Chainsaw 1
Bullets (large) 1
Shells (large) 1
Clip (large) 1
Ammo belt 1
Grenades 3
Cells (large) 1
Rockets (large) 1

Locker codes[edit]

For the sources of the codes, see Doom 3 locker codes.
  • Storage locker #104 - Security: 579. Contains: security armor, ammo belt, rockets (small).


  • Rather infamously, one of the chainsaw zombies on the level wears a party cone. A notice board in the lobby of Delta Labs Level 1 proclaims that today is "Jim's birthday party", so this particular chainsaw zombie is probably what became of Jim.
  • In the Delta 4 Main Ready Room, in one of the corners, the words "You laugh, it works" are written in blood, amongst other writing. Finding (getting close to) this particular line grants an achievement in the BFG Edition with the same title.
  • The ending cutscene briefly shows footage of this level as Recon Zulu provides a visual status on how much damage the base has sustained from the invasion.


External links[edit]