How did the three skeleton key get its name?

It earned its name from the story of the three convicts who, escaping from Cayenne in a stolen dugout canoe, were wrecked on the rock during the night, managed to escape the sea but eventually died of hunger and thirst. When they were discovered, nothing remained but three heaps of bones, picked clean by birds. The story was that the three skeletons, gleaming with phosphorescent light, danced over the small rock, screaming.