Dinosaurus!

On the ocean floor off a Caribbean Island, an American engineer building a new harbor sets off a blast that uncovers the frozen bodies of a Brontosaurus, a Tyrannosaurus Rex and a Neanderthal man. The dinosaurs are hauled ashore by the construction crew, who are unaware that the giants are actually alive, in a state of suspended animation. Struck by lightning during a fierce tropical storm, the monsters awaken and prowl the island jungles. Also restored to life is the cave man, an amiable brute who joins an island boy in a series of wacky misadventures. (official distributor synopsis)