Coast Guard Petty Officer 1st Class Shawn Vandenberg, an aviation maintenance technician at Air Station Traverse City, Michigan, conducts ice thickness sampling in Lake Superior near Whitefish Point, Tuesday, March 17, 2015. The ice depth samples gathered will allow the U.S. and Canadian Coast Guard to plan ice breaking routes in support of the start of the shipping season. (U.S. Coast Guard photo by Petty Officer 2nd Class Alex Major)
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