Go back to the lift and use the keypad on your right.
You now need to move fairly quickly and remove the other two sections of the gantry.
The second keypad is two floors down. The 3rd keypad is a further 4 floors down
Now climb back up to the top of the rocket and pick up a sniper rifle
==Shoot any guards around the building where you started and use the wire to slide back there.gvyvtttttttttttttttttttttttttttttttttttttt8uuh77ygn8njiojuyhnff==
