Explorers Vie To Find The Deepest Place On Earth04:56
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In 2004, two teams of scientist-explorers delved into caves in southern Mexico and the former Soviet republic of Georgia to find out which one went the farthest down. We revisit a conversation we had with James Tabor, who chronicled the quest in the book, "Blind Descent: The Quest to Discover the Deepest Cave on Earth" which was recently released in paperback.

This segment aired on April 7, 2011.

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