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 building separated by a short walk outside. It is a small tutorial level covering a few more features in the game.

In the Communications Building, things start to go awry. The shooting begins here, and zombies are first seen. The imp is introduced at a cutscene.

PDAs

 * Daniel Young
 * Mark Ryan
 * Grand Baston
 * Frank Delahue

Charaters

 * T. Brooks
 * Daniel Young
 * C. Rogers
 * R. Fry
 * Ian Sinclair
 * Jonathan Ishii
 * Joe
 * UAC announcer
 * Sergeant Kelly
 * Mark Ryan

Enemies

 * Former Humans
 * Zombies
 * Jonathan Ishii (Zombie)
 * Maintenance Zombie
 * Scientist Zombie
 * Z Secs
 * Pistol Z-Sec
 * Shotgun Z-Sec


 * Demons
 * Imp

Weapons/Items

 * Flashlight
 * Pistols
 * Shotguns
 * Machine Guns
 * Medkit
 * Security Armor
 * Armor Shards
 * Bullets
 * Shells
 * Clips
 * Adrenaline
 * Air Canisters
 * Plasma Cell

Cabinets

 * Cabinet #023: 531