171126-N-TY130-403 COMODORO RIVADAVIA, Argentina (Nov. 26, 2017) The motor vessel Sophie Siem gets underway from Comodoro Rivadavia, Argentina with Undersea Rescue Command (URC) and the Submarine Rescue Diving and Recompression System (SRDRS) which operates the deep diving rescue vehicle, the Pressurized Rescue Module (PRM). Undersea Rescue Command, the U.S. Navy's only submarine rescue unit, mobilized to support the Argentine government's search and rescue efforts for the Argentine Navy diesel-electric submarine ARA San Juan. (U.S. Navy photo by Cmdr. Joe Bell/Released)