Asteroid X57

Asteroid X57 was added to the galaxy map for Bring Down the Sky. It was being moved across the Asgard system to Terra Nova using fusion torches. Once the asteroid had been mined out, the ores would finance turning the 'shell' of the asteroid into a new orbital facility for the colony. However, batarian extremists hijacked the asteroid, attacked the engineering team bringing it across the system, and set X57 on a collision course with Terra Nova.

Locations

 * Main facility. The underground headquarters for the mining and engineering crew, consisting of several offices, a central hub and a medical room. The facility cannot be entered without a pass card, and the batarians have changed the entrance codes.
 * Fusion torch stations. Facilities attached to each fusion torch. All are heavily guarded with turrets and batarian ground troops. Simon Atwell warns Shepard that one of them is surrounded by blasting caps that are effectively anti-tank mines, so it has to be approached on foot.
 * Survey stations. Three survey stations are scattered around X57's surface, each staffed by one of Atwell's engineers. Since the batarian attack they have dropped out of contact.
 * X57 Radio. A small shack housing a pirate radio station, run by X57's engineers. Shepard can find several unrecorded slogans on the computer which recall sci-fi series like Babylon 5. One of them, "When Your World is Hollow, We Help You Touch the Sky" refers to a classic Star Trek episode that featured an asteroid hitting a human colony.

Tactics

 * For a fast kill near the 'minefield' fusion torch, Lift and Throw the batarian troopers into the armed blasting caps.
 * In one of the torch stations, where rocket drones are being set on you by a batarian engineer, they will return to the same point on the upper level to recharge. This is a good opportunity to Sabotage or Overload them, or use AI Hacking to take advantage of their aerial position against the batarians.