Spawn a Panzer at V82 (Hanger) in off line mode. Use F3, then F8 to see the hill disapear, Panzer floating about 14 feet above the ground. Drive forward a bit toward the visible map room and an invisible map room suddenly appears if your view is near ground level, between the top of the hill level and the tile base level. Look around and the Tower building can be seen floating above the ground.
