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NOVA l Extreme Cave Diving l PBS

See the full episode at http://video.pbs.org/video/1405567128A team of intrepid scientists journey into one of Earth's most dangerous and beautiful underwater frontiers. Debuting on PBS Feb. 9, 2010 (check local listings at http://bit.ly/b2S2ox) For more information please visit our website http://www.pbs.org/wgbh/nova/earth/extreme-cave-diving.html
Length: 00:31

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