Cave Explorers Find a House Deep Inside a Cave — Then They Hear Something Inside

“It means someone with tuberculosis,” Mara said. Ethan looked from the tablet to the cottage. “You mean people lived here while they were sick?” Mara opened the notes attached to the old illustration. The drawing showed a house formerly used by patients, and the records explained why it existed. In 1842, a doctor named John Croghan had brought sixteen tuberculosis patients into Mammoth Cave. He believed the cave’s steady temperature and air might help them recover when ordinary treatments had failed. Mara read it twice.

The patients had not arrived to explore. They had hoped to survive. Enslaved workers had built two stone cottages and eight smaller wooden huts to house them underground. Mara looked toward the second building. She had mistaken the two surviving stone cottages for miners’ homes, but they were the remains of an experimental hospital. “All the way down here?” Ethan asked. Mara nodded. “Some of them stayed for months.” She imagined patients carrying lamps between buildings, counting on a doctor’s promise that the air would make them stronger.

Then she noticed another heading in the notes. The treatment had lasted only a few months. Mara scrolled down, wondering what had brought it to an end.