Mr. Mole's Tunnel Bridge

Mr. Mole's Tunnel Bridge is a fighting arena in Don Bluth's Thumbelina. It is a place where the Mole kills beetles, stuffs them, and pins them to the walls. In one tunnel, on a bridge suspended high above a wad of spider webs, Cornelius and Grundel duel over Thumbelina, until they fall into the chasm below. Grundel survives with a broken leg, though.