The crew of Coast Guard Cutter Mackinaw runs the bubbler system to push ice away from the hull of the cutter as it maneuvers through ice on the St. Marys River near the Soo Locks in Sault Ste. Marie, Mich., March 20, 2014. The Coast Guard is ice breaking in the river to prepare for the scheduled opening of the Soo Locks, March 25. (U.S. Coast Guard photo by Petty Officer 2nd Class Levi Read)