Diver Dan, Minerva, and their fish friends have a party on a wrecked treasure ship.; Baron Barracuda tries to get Dan caught in a giant clam.; The Baron and Trigger visit their old school teacher, Mrs. Heda Shellback.; Baron Barracuda and Trigger set a trap for Diver Dan with an electric eel hiding in a treasure chest. The Baron drops his monacle in the chest and is shocked by the eel when he tries to retrieve it.