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Drain the Great Lakes

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    3.7 / 5.0
    Avg. 3.7 (14 ratings)

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Episode     Online Video

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(First Aired: 
Computer-generated imagery is used to reveal hidden secrets of North America's Great Lakes, the largest system of free fresh water on earth.
  • Mon 4/3
  • 6:00PM-7:00PM
  • NatGeo