Pre-impact it was known as "Stone Mountain Correctional Facility". The location is the destination for the quest "Liberate Captain Marshall". Once the player completes this mission, they cannot return, and any Collector Cards left will be inaccessible, making obtaining the Achievement/Trophy "Gotta Have 'em All" impossible. Teeming with the Authority, it's also full of automated Sentry Turrets, so the player should take some EMP weapons there. The EMP Grenade schematic and first EMP Grenades in the game are found right near the start of the level, to help one cope. Locked Doors: 1