Delta Labs

Delta Labs is one of the prominent locales in Doom 3. It is also one of the hardest parts of the game as the player fights more than a hundred demons, suffers from hallucinations and must unlock several lockers. The lack of cutscenes makes gameplay constant, though Dr. Betruger constantly adresses the player and the demons over the loudspeakers. In addition, the main portal is located at Delta Labs.

The player returns to Delta Labs after retrieving the Soul Cube to find the area in ruins and coated in growth.

Delta Labs also makes an appearance in Resurrection of Evil, though only barely recognisable.

Sector 1
Sector 1 is the main area and entrance to the Delta Complex. It houses Power, Control, Administration, and it's own Reactor. The only entrances are the Monorail Station and the CPU Complex. Sector 1 also has the main warehouse in the Delta Complex.

Sector 2
Sector 2 is divided into two areas. 2A, is the main Medical Facility in the UAC. 2A also has one of the first teleporters in the UAC. 2B, houses some demons from Hell and research. 2B, also does research on Site 3's main Artifact, The Soul Cube.

Sector 3
Sector 3 has test teleportation. The teleport chambers are divided into 3 chambers. The first chamber has two locations: The room itself, and in the upstairs of the chamber. The second chamber has three locations: The room itself, a Hallway, and a Storage Room. And the last chamber (which is the main teleporter in this sector) has four locations: Another Storage Room, a Hallway near Test Chamber 1, a office near Test Chamber 3, and near the entrance to Sector 4.

Sector 4
Sector 4 is the smallest sector, but houses the Main Portal to Hell.

Levels taking place in Delta Labs

 * Delta Labs - Level 1: Union Aerospace Research Division
 * Delta Labs - Level 2a: Union Aerospace Research Division
 * Delta Labs - Level 2b: Union Aerospace Research Division
 * Delta Labs - Level 3: Union Aerospace Research Division
 * Delta Labs - Level 4: Union Aerospace Research Division
 * Delta Complex: Union Aerospace Research Division
 * Delta Labs - Unknown: Union Aerospace Research Division

Triva

 * The Delta Complex is right over Site 3.
 * Delta Labs makes another appearance in Doom 3: Resurrection of Evil, but it is unknown if those are the same or another Delta Labs. Some people suggest that the Marine got back to Mars City, while others believe that there were another Delta Labs near the Phobos Facility.