Drain the Great Lakes

Drain the Great Lakes
Wed 5 Jul 10pm - 11pm National Geographic Channel HD
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Wed 5 Jul, 10pm - 11pm National Geographic Channel
Wed 5 Jul, 11pm - 12am National Geographic Channel +1
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Summary

Documentary revealing what is beneath North America's Great Lakes - Lake Superior, Michigan, Huron, Erie and Ontario - examining geological secrets and pieces of human history that have been hidden from sight.
Documentary