Westwind defense line, the final refuge of the Panhuman Alliance.
More than a thousand asteroids had been hollowed out and fitted with large cannons and fortifications. They were like warships that did not move, ready to defend against any enemy invasions.
A long time ago, when the other neighbor of humanity, the Na'vi, made their move, the Alliance had relied on these natural asteroids to build bunkers. Many years had since passed, and the Na'vi no longer invaded the Panhuman Alliance, and it was instead the insectoids, their much farther neighbor, who pushed their way to the Westwind defense line.