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Diving the Mexican Underground; Venomous Fish; Greenland Sharks

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

English
Cast & Crew
  • Originally Aired October 30, 2009
  • Runtime 30 minutes
  • Content Rating United States of America TV-G
  • Network PBS
  • Created April 14, 2011 by
    Administrator admin
  • Modified April 14, 2011 by
    Administrator admin
Name Type Role
Art Cohen, Jonathan Bird Writer
Jonathan Bird Director