Uncovering the Dangerously Guarded Secrets of Bahamaian Blue Holes - Kenny Broad

National Geographic Explorer Kenny Broad endures the dangers of Scuba diving in caves as deep as 300 feet below the surface in the name of science. Broad stresses that on land, he's much more accident prone than underwater, but says that he takes the risks that he does to study "blue holes" on Bahamian islands to learn about our past. Broad explains that one mystery that still leaves him guessing is the fact that humans only very recently settled the Bahamas, despite the fact that humans had been living on the North American mainland, just 60 miles away, for thousands of years.