The Gang come to the aid of a German being attacked in an alley. He reveals that he was attacked earlier when someone broke into his flat, and asks the Gang for help. It turns out the German is the only one who knows the location of a sub full of sunken treasure. The Gang agrees to help him in return for a share of the loot to pay for the memorial hospital for Claude. They dive for the treasure and recover the only surviving piece - a jeweled swastika. But when they bring it up and it's confiscated by French custom officers. But they quickly discover that the custom officers are fakes who killed the real officers, and come up with a plan to recover it and make a little more money.