At an outpost in the Caribbean, Nina, the daughter of Antone, a local sponge fisherman, is in love with Carl, a diver on one of the schooners. On a hunting expedition, Juan, a jealous rival, fouls the air line; and when a monstrous sea bat appears, Juan leaves Carl to drown. In despair, Nina turns to the voodoo rites of the natives and declares she will marry the man who captures the sea bat. Reverend Sims, actually an escaped convict, arrives on a tramp steamer, converts the girl, and in the process falls in love with her. They decide to elope by motorboat, but Juan, who has recognized Sims, succeeds in capturing him with the aid of a friend. The trio are attacked by the sea bat, and all are drowned but Sims, who returns to the waiting Nina. More on Wikipedia or Mubi
Watch The Sea Bat (1930)