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)