City Under the Sea

American mining engineer Ben Harris is working on the Cornish coast in England when he finds a body washed up on the beach. Ben, Harold and Harold's chicken follow the trail through a secret door into the caves under the house where they are sucked into a pool. They emerge in a cavernous city on the ocean floor. The city is now inhabited by a group of smugglers led by the cruel and tyrannical Captain who hid there in 1803.