They are used when Electric Pillars around the perimeter have deactivated or been destroyed as a last resort weapon. The weapon-as seen during the movie-can be clearly described as a barrel bomb dispenser. Activated by a switch, the weapon deploy and throw unguided barrel bomb to an assumed area of explosion nearby. The massive explosive is seen to have a equivalent power of an air dropped bomb. The weapon must be placed on higher with no obstacle to the target ground.