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

Dogora (1964)

In the distant future of 1968, numerous ships and submarines have mysteriously vanished while crossing the North Pole. The Tigershark is dispatched to investigate their disappearance, but the life form they encounter may be too powerful for their advanced weapons.

The Atomic Submarine (1959)

Trashy Classic Sci-Fi Monster film ahead! Operation Deep Freeze, a scientific expedition to Antarctica discovers unusual tree specimens. When specimens are shipped out for further study, the trees are accidentally introduced to a south seas Navy base, soon revealing themselves to be killer, acid-secreting monsters that live by night.

The Navy vs. the Night Monsters (1966)

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

Atragon (1963)

A secret colony of perpetually young Victorian smugglers and their gillman slaves is discovered by an American in Cornwall in 1903. When they kidnap a woman, a group of British rescuers try to save her.

War-Gods of the Deep (1965)

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

Terror from the Sea