Attack of the Crab Monsters

Attack of the Crab Monsters is a 1957 independently made American blackandwhite science fiction film, produced and directed by Roger Corman via his Los Altos Productions, starring Richard Garland, Pamela Duncan and Russell Johnson. The film was distributed by Allied Artists Pictures Corporation.

As the island continues to fall away into the Pacific, and after barely escaping from a laboratory that is about to collapse, the surviving trio witness up close one of the intelligent giant crabs for the first time. This is Hoolar who speaks to them via telepathy and vows to go to the mainland with her fertilized eggs when the island is gone and the three scientists are dead to feed upon on even more humans, absorbing those minds in the process. One of the remaining three then sacrifices himself in order to kill the monster and her unhatched brood.Following the giants destruction, the two inlove survivors embrace on the small portion of what remains of the island. ........

Source: Wikipedia