Batboat's armaments include a pneumatic harpoon, a launching grapnel, depth charges and active-homing torpedoes. The grapple (or grapnel) resembles a three-pronged anchor. A ship's anchor is a type of grapple, especially the "grapnel" anchor. Special "grapnel tanks" towed hooks to pull away the German barbed wire. The wizard then gives Oliver a "housbreaker" and a magical grapnel. A traditional design, the grapnel is merely a shank with four or more tines. A grapnel can clear up to 99% of the trip-wires in a single pass.