Season 3, Episode 7 Yucatan Sinkhole, Shark Biology and Ocean Defenses

First Aired: October 8, 2011

The Muyal-Ha sinkhole in the Yucatan, which is more than 100 feet deep; the biology and diversity of sharks.

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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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