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YouTubeShadow Ledger
How Draining Niagara Falls Exposed a 12,000-Year Secret #documentary #mystery
In 1969, engineers shut off Niagara Falls. What they found underneath... no one expected. This is the true story of the day the Falls went dry. This video tells the true story of the only time in recorded history that the American Falls at Niagara was fully drained. In June 1969, the U.S. Army Corps of Engineers built a 600-foot cofferdam to ...
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