The Coast Guard Cutter Mackinaw, a 240-foot icebreaker homeported in Cheboygan, Mich., backs down toward the motor vessel Manitowoc in the vicinity of Whitefish Bay in order to use directional wash from the Azipods to break the ice plug that had developed off her bow, March 26, 2013. The Mackinaw along with the Coast Guard Cutter Alder, a 225-foot buoy tender with ice-breaking capabilities homeported in Duluth, Minn., and the Canadian Coast Guard Ship Samuel Risley worked together to get the Manitowoc moving again.