Mars City (Location)


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Mars City is a UAC base located on Mars, constructed 25 years before the events of Doom 3. Highly trained Marines and a new unit called Mars-Security are stationed there to protect it. Mars City houses the Marine Headquarters, in the command of Sergeant Kelly. Mars City has plenty of office space, labs, in-base communications, a break room, a medical Area, and it's own armory. Mars City is the main facility on Mars, because it has the only boarding area to leave or enter Mars. Mars City has its own underground maintance area. The base is protected by operational Sentry Bots. There is an elevator that leads to the Monorail Station. For fun, Mars City has an Arcade machine, Super Turbo Turkey Puncher 3.


Mars City Underground

Mars City Underground is what keeps Mars City operational. It has lots of storage space, power, and its own Communications Arrays. Most of the workers are freaked out going down there. Before you enter the area, there is a security checkpoint in control of T. Brooks. Mars City Underground also has an airlock that leads to the surface.


Administration houses the UAC Board directive on Mars and is the main reporting site for all workers.

Alpha Labs

The Alpha Labs were a research lab built in the year 2130. Its main focus was to create technologies like the EPD or the Hydrocon. Divided in 4 sectors, these Labs managed to create some of the most astonishing technologies ever seen.

Enpro Plant

The Enpro Plant is a plant dedicated to supply energy to Mars City and to create the Plasma Cells necessary for the Plasma Rifle. A huge Core powers the entire plant.

Communications Transfer

Communications transfer is a shortway between the communications room and the Enpro plant. The Oxygen tanks are held there after many pressure failures had ocurred.

Communications Room

The Communication Room is the main comms room. Its satellites are automatically connected with UAC-Earth and works together with the redirectioning station Phobos.

Recycling Plant

The Recycling plant is perhaps one of the most important facilities on Mars. Its main focus is to recycle the waste products of the Mars base. It is divided into two sectors. The Marine is introduced to Dr. Betruger in the second sector.


The Monorail is a station that houses the monorail train. It is used to transfer personnel from the Recycling plant to Area 2 or to the Delta Labs. The Main entrance of the Delta Labs is housed by an automatic turret, which can be disconnected in the security room.

Delta Labs

The Delta Labs are the most advanced research complex on Mars. It houses four sectors and the Third Generation Teleporter, which is the cause of the invasion at the beginning of the game.

CPU Complex

The CPU Complex manages the entire informatic operations on Mars.

Site 3

Site 3 is the sorting place of any archeological discoveries and artifacts from the Caverns.


The Caverns are the first installations ever made on Mars. Its main focus is to discover archeological artifacts and send them to Site 3.

Main Excavation

The Main Excavation was were the Soul cube and many other relics were found. It also houses the Gateway of Hell and the Cyberdemon.