Eagle Island (1961)

Archaeologists have found on the island of Eagle remnants of slave shackles. On the expedition, rumors of an old legend spread about the figure of Achilles, who sometimes appeared on the local rock, and who was helping the sailors to find a safe fairway in bad weather. The expedition after a long search finds nothing and moves out, but the leader decides to stay. And after a while, he discovers a mysterious state created by runaway slaves...