The Coast Guard conducts an overflight of the Straits of Mackinac in Michigan, April 6, 2018. Skim ice and water discoloration may appear as pollution from a distance. However, Coast Guard pollution investigators have not identified any signs of a sheen following a mineral oil discharge from underwater utility cables that occurred, April 3, 2018. (U.S. Coast Guard video by Petty Officer 3rd Class Ryan Hogan).
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