FILE - In this Sept. 23, 2015, file photo, the Mackinac Bridge is visible from a marker near Enbridge Line 5 on the northern shore of the Straits of Mackinac in Michigan. Michigan Gov. Rick Snyder said Wednesday, April 11, 2018, that twin oil pipelines beneath the waterway linking two of the Great Lakes apparently were damaged by the same vessel believed to have caused a recent 600-gallon coolant fluid leak from electric cables. Snyder said that Enbridge Inc. had notified the state about the damage to its Line 5 pipes, saying it was minor and consisted of three small dents. (Neil Blake /The Grand Rapids Press via AP, File)
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