There’s a growing number of scientists getting excited about the Bahamas. But it’s not just the tropical vacations that have their interest. It’s what’s underneath the islands—huge caves systems filled with water. They’re called blue holes, and deep inside of them, they hold clues to past climate change, new species of invertebrates, even human remains from people who lived on the islands long before Columbus visited. In this podcast, hear from Kenny Broad, a researcher who led a diving expedition into blue holes last year. Listen below.

Originally released on the NOVA podcast feed February 2, 2010