Kenny Broad, National Geographic’s Explorer of the Year for 2011, is also an accomplished cave diver who pursues this extreme avocation not for sport but to gain valuable scientific insights. Doubling as a recognized, and quite funny, environmental anthropologist, Broad uses his research to solve problems of climate change and freshwater resource management. Join him for a fantastic voyage into the beautiful but dangerous “blue holes” of the Bahamas — a potential treasure trove of scientific knowledge, captured in incredible images and video.