Dogora is an alien who wants to take possession of Earth's diamonds at all costs and extract the precious carbon contain...

In an effort to find an economical means of purifying salt water, a joint U.S.-Japanese military command has been set up...

An air, sea, and land battleship captain rescues his daughter from the earthquaking underwater dwellers of Mu.

An ageless submarine captain ferries three explorers to an underwater colony threatened by a villain.