ICE BREAKERS U.S. Coast Guard Cutters Biscayne Bay, bottom, and Mackinaw, top, break ice in the lower end of the Rock Cut in the St. Marys River in Mich., Dec. 22, 2010. The cutters were called to break ice in the area after the freighter Cedar Glen, center, became beset by ice the previous day. Cedar Glen was beset for approximately 19 hours before the Coast Guard vessels were able to free it. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 524934-B-KIN63-314.jpg Photo Gallery