Blood Tide

Blood Tide is a 1982 British horror film starring James Earl Jones, José Ferrer, Mary Louise Weller, Martin Kove, and Deborah Shelton. A young American couple visiting a Greek island soon find that an ancient monster has been released, forcing the villagers to return to the practice of human sacrifice to appease it.

An adventurer hunting for treasure in Greece accidentally frees a monster that forces local villagers to sacrifice virgins