While the other two took the main entrance, you and your co-workers, 247 and 512, took the fire exit.

247: "Alright, let's see what we can find!"

512: "Don't die." she says with a scowl.

You look around, finding yourself in a room with a few bits of scrap, and a landmine in the corner. Looking down the hallway, there appears to be a turret. Oh dear.