171126-N-TW634-086 ATLANTIC OCEAN (Nov. 26, 2017) Workers from Phoenix International, mobilized with Undersea Rescue Command (URC), deploy side-scan sonar equipment from the Norwegian construction support vessel Skandi Patagonia near URC's submarine rescue chamber. Undersea Rescue Command, the U.S. Navy's only submarine rescue unit, is mobilized to support the Argentine government's search and rescue efforts for the Argentine Navy diesel-electric submarine A.R.A San Juan (S 42). (U.S. Navy photo by Mass Communication Specialist 2nd Class Derek Harkins/Released)