BY ERIC SHARP
FREE PRESS STAFF WRITER
March 31, 2003
The U.S. Coast Guard icebreaker Mackinaw slices through ice up to 4 feet thick in Whitefish Bay, breaking it into huge floes and leaving a wide track of broken ice and open water in its wake.
Inside the 290-foot ship, the ice sliding along the steel hull makes a loud and constant rumble, like heavy surf pounding onto a beach.
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