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Friday, Jun 21, 2013 - 6:00 AM    "Extreme Cave Diving" Cave diver and environmental anthropologist Kenny Broad heads an interdisciplinary team of climatologists, paleontologists and anthropologists into underwater caves, or blue holes, formed during the last ice age. Broad is investigating the hidden history of Earth's climate as revealed by finds in this "alternate universe." G
Show is TVG Show Is Closed Captioned

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