On a dark night early in the 17th century, a group of men gathered atop the seaside cliffs outside of Castlehaven, a small village on the southwestern coast of Ireland. The flickering light from their lanterns revealed a hidden stairway cut directly into the rock, which they carefully descended down to the sea. Placing their lanterns into two small niches that had also been hollowed out of the rock, the men waited. From the darkness, a ship slowly emerged and drifted, silently, toward them. Visiting the same location today, now…