Environmental Anthropologist Kenny Broad has focused his career on challenging expeditions to unexplored, underwater caves. He's attempted to make connections to scientific challenges and their impact above ground, including climate change. Broad explains his passion for being underwater and the difference between being a prepared explorer and an adrenaline junkie.

More than thirty years ago, Carol Beckwith and Angela Fisher met in Kenya. Since then, they've traveled to forty countries and explored at least one hundred fifty African cultures.