SHERIDAN LAKE, BRITISH COLUMBIA, CANADA - Members of Mobile Diving and Salvage Unit (MDSU) 1 and the Canadian Armed Forces' Fleet Diving Unit Pacific perform pre-dive checks during an ice diving exercise at Sheridan Lake in British Columbia. The ice diving exercise enhanced interoperability between U.S. and Canadian diving units by accomplishing joint technical diving and unit-level training evolutions. MDSU-1 is a component of Explosive Ordnance Disposal Group (EODGRU) 1 that provides combatant commanders the expeditionary capability to clear ports, piers and waterways; assist vessels in distress; and conduct salvage of ships, aircraft and other objects from the water. (Photo via DOW)