Members of the Coast Guard Cutter Buckthorn, a 100-foot class inland buoy tender, move a 5,000 pound concrete sinker across the icy deck of the cutter while conducting aton as part of Operation Fall Retrieve near the Les Cheneaux Islands in Lake Huron, Nov. 12, 2013.
This operation is the largest domestic ATON recovery operation in the U.S. (U.S. Coast Guard photo by Seaman Steven Strohmaier)