However, things change when one the men is in a submarine trapped beneath the ocean and the other, a diver, is sent down on a rescue mission.

After losing a submarine and fifty crew in a battle with a German ship during WWII, a Royal Navy officer gets a second chance in a daring raid with midget subs.

Pepper's Lonely Hearts Club Band, Captain Fred (Lance Percival) and his Yellow Submarine recruit The Beatles to help save Pepperland. Along the way, they fall through the Sea of Time, Sea of ...