A Roman ship was found sunk off the coast of Monte Carlo. Montana, Alfred and Melissa, under a directive from Professor Gilt, head to Monaco to look for the legendary bronze statue of Sifnos. But Lord Zero is ahead of them, having dug a tunnel under his mansion leading to the bottom of the sea. In the city of Monte Carlo, a battle between Montana and Dr. Nitro's giant mechanical crab begins to unfold. Location: Monte Carlo, Monaco