Mars City (Location)

Mars City is a base of the UAC located on Mars, constructed 25 years before the events of Doom 3. Highly trained Marines and a new unit called Mars-Security, regular guards of the base, were protecting it. The events of Doom 3 takes the player to the base the same day that the Demons invade the base. Most of the Mars-Security Squad are transformed into Zombie-Security and the marines begin battle with the forces of Hell, with unsuccesful results. With that the Radio becomes silent, and the player is now one of the very few marines left alive.

Locations
Mars city has multiple locations that were overrun by Hellish forces. There can be seen corpses of scientists, Mars-Security, marines that were killed in combat and sometimes skeletons. The locations are:

Marine HQ

Marine HQ is the Base of the Marine operations in Mars city. Here Sargeant Thomas Kelly gives the player instructions to locate a missing Delta Labs scientist. It was heavily guarded by marines and an automatic turret. However it didnt prevent the demons from destroying the area.

Main Administration Office

An office that monitorized all the actions of the Delta Labs. Some very important figures, like Elliot Swann, Councellor of the UAC, were in the base. When the invasion happened, all the executive employess, except for Swann, were killed when they attempted to flee.

Alpha Labs

Alpha Labs were a section of the Mars city Base that was first created before the base was complete. It was focussed on creating alternative sources of energy. One of the most spectacular Creations was the Hydrocon and the Decompresser of Phase 1. The Hydrocon become instabillized during the invasion. One single misfired bullet could destroy the entire Lab.

Communications Tower

The Communications Tower is a building that allows communications with Earth. Whilst the player is on the way to send the initial transmission for reinforcements, Campbell and Swann destroy the main comms system, leaving the player to attempt to find the secondary system and send the transmission from there.

Monorail Station

The Monorail Station is a track that connects the Alpha Labs and the Delta Labs. A train keeps supplies running to the two areas, and brings personnel to Delta Labs. The trains must be checked in the control office that opens the door.

Delta Labs

The Delta Labs is the biggest and greatest section of the base. The Delta Labs were directed to the Teleports and monitorized by Dr.Betruger, the director in chief of the Delta Labs. It is the origin of the invasion.

Enpro Plant

An installation past the Alpha Labs. This is where Bravo Squad is killed. The Enpro Plant was designed to produce Plasma Guns and plasma ammo. However, there was an incident; an Employee of the UAC went crazy and shot himself with a Plasma Gun. After this, there were many doubts as to whether such firepower was necessary to guard the area.

 Recycling Plant 

The Recycling Plant was designed to recycle raw materials from the Mars surface, and send them to Alpha Labs. It has many vent systems so that the toxin level doesn't go past 50%. Dr. Betruger deactivated these systems in an attempt to kill the Marine. However the Marine managed to reactivate the systems and continues to Delta Labs.