Mars City Underground: Union Aerospace Subsystems

Mars City Underground: Union Aerospace Subsystems is the second level of Doom 3, composed of the main area and an abandoned communications facility separated by a short walk outside. It is a small tutorial level covering a few more features in the game.

In the Communications Facility, things start to go awry. The action begins here, and zombies are first seen. The Imp is introduced at a cutscene.

Note: You may rescue the scientist in the Processing Unit area; he says "Oh, thank you. I'm getting out of here" and disappears through a door. Later, you will see an opened storage cabinet. If the scientist is killed, this cabinet will be closed.

PDAs

 * Daniel Young (Kill Daniel to get his PDA)
 * Grant Baston
 * Mark Ryan (Kill Mark to get his PDA)
 * Frank Delahue

Characters

 * T. Brooks
 * Ross Fry
 * Jonathan Ishii
 * Thomas Kelly
 * C. Rodgers
 * Mark Ryan
 * Scotty
 * Ian Sinclair
 * UAC announcer
 * Daniel Young

Cabinet Codes

 * Storage Cabinet #023: Supplies - 531