171126-N-TY130-004 COMODORO RIVADAVIA, Argentina (Nov. 26, 2017) Undersea Rescue Command (URC) conducts training prior to getting underway aboard the motor vessel Sophie Siem. Sophie Siem contains 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 Lt. Karl Schonberg/Released)