- "After incurring damage during the ISA invasion of Helghan, this subterranean mining platform has been converted to process nuclear Petrusite. Now that it's back in full-scale production, the ISA will again battle Helghast and mercenary forces between the structures of Tharsis Depot. This time they intend to finish the job they started. Under the cavern's artificial light this is a great map to play Guerrilla Warfare or Warzone on. A Mercenary version of the Killzone 2 classic."
- —Killzone.com Description
The map's small size encourages blood, chaos, and gunfire at all times. This level is full of alternate paths one can take to get to an objective, or simply to the opposing faction. It is full of broken machinery, industrial scrap metal, and high bridges and sniper vantage points.
The map is based off the single player mission Tharsis Refinery.
The map returns for Killzone 3's multiplayer in the From the Ashes pack, and has jetpack spawners placed throughout the area now.