Doom 3 - Mars City Underground: Union Aerospace Subsystems - Absolute HD Mod
0MARS CITY UNDERGROUND - "The Mars City Sublevel was one of the first multi-purpose installations built on Mars. Housing storage, environment systems, localized energy production, communications arrays, and rudimentary research systems, the aging facility is vital to keeping Mars City operational."
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.
In the Communications Facility, things start to go awry, and the invasion begins. The action begins here, and Zombies are first seen. The Imp is introduced at a cutscene.
Valve 1 Failure Code in Energy Processing: 842 (This will cause the fire to be extinguished and you will gain access to armor shards and ammo.)
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