It's ice-breaking season at Sturgeon Bay as the U.S. Coast Guard clears a path for the winter fleet to set sail.
The Mackinaw is the biggest ice breaker on the Great Lakes, weighing in at 3600 tons.
The commander says the ship's ice-breaking action is like two airplane propellers below water pulling the ship through the ice.
The Mackinaw will be breaking ice on Green Bay waters, near Sherwood Point. It''s making way for about 8 large vessels that will leave in about a week.