Season 2, Episode 4 Diving the Mexican Underground

First Aired: October 24, 2009

The underground rivers of Mexico's Yucatan peninsula; venomous fish; the Greenland shark.

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  • Premiered: May 17, 2008
  • Rating: TV-G
  • Premise: Underwater photography is featured in reports on marine life, nautical exploration and deep-sea research. (more)

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