Man-made underground passage

British rule ended in 1922, but the old underground passage near the ringfort in County Louth remained a local mystery. People in the area still spoke of a hidden cave, and in 1924 a young man named Seamus began digging behind the stone wall at the edge of the field. He did not find gold or bones, only a narrow passage cut through solid rock. The opening had been blocked for generations, perhaps to keep water out or to hide the passage from strangers. Seamus carried soil to the road in a wheelbarrow and breathed in the dark air until his lungs burned. When he emerged, he had no memory of the days inside, only a thin line of chalk on his hands and a hunger that would not leave him. The passage disappeared again when the field was flooded, but the chalk line still appears on the hands of children born in that area.