160127-N-ZZ999-004 LONE BUTTE, Canada (Jan. 27, 2016) Navy Diver 2nd Class Tucker Ludy and Navy Diver 3rd Class Matthew Sanders assigned to Naval Diving and Salvage Training Center (NDSTC) in Panama City, Florida prepare for ice diving during an annual ice diving course in Lone Butte, Canada Jan. 27, 2016. The course is taught by Coast Guard Instructors attached to NDSTC. (U.S. Navy Photo by Cmdr. Hung Cao/Released)