Brides of Blood (1968)

Plot

A group of American researchers delves into the effects of nuclear radiation on a secluded island, only to stumble upon a terrifying man-eating creature. Their expedition quickly turns into a fight for survival as they confront the horror lurking within the island's depths. As they uncover the chilling secrets tied to the monster's origins, the team must grapple with both the physical and psychological threats posed by their monstrous discovery. Tension escalates as they race against time to escape the island's deadly grasp.