Octopus - ( Sci fi / Horror ) - 2000

During the Cuban missile crisis in 1962, a Russian submarine enters restricted waters. On board is a nuclear cargo destined for Castro. The Americans attack and destroy the sub. 38 years later US submarine Roosevelt is in the same waters. An unknown object attacks and disables the sub with devastating force and drags the vessel to the bottom of the ocean. On the ocean bed are dozens of wrecks, among them the Russian sub destroyed in 1962.
As well as a creature of unbelievable size and strength.