Listening Post 81 - Ultima Black VIc
Pushing into the barracks and living quarters, you see this is where the bulk of the combat was. It was easy to imagine a hasty defense, as you saw crates and bunks overturned and scattered bloodstains and weapon impacts. The attackers took the defenders mostly by surprised, some scattered return fire was visible but aside from that, again, no bodies, no weapons. Personal monitors and data feeds were offline, showing only static and a [OFFLINE] message. No alarms and again, the cameras have been destroyed. Almost no sound but the life support system fans makes for an eerie sweep of the structure.
From here, you would have to descend via stairs further into the complex, the control center and armory being buried at the very bottom of this rock.