171121-N-TW634-105 COMODORO RIVADAVIA, Argentina (Nov. 21, 2017) Sonar Technician (Submarines) 2nd Class Troy Robinson, left, and Sonar Technician 1st Class Howard Mann, both assigned to Unmanned Undersea Vehicle Squadron (UUVRON) 1, perform maintenance on Iver 580 unmanned underwater vehicles (UUV) before loading them onto the Norwegian construction support vessel Skandi Patagonia. Undersea Rescue Command, the U.S. Navy's only submarine rescue unit, and UUVRON 1 are 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 Mass Communication Specialist 2nd Class Derek Harkins/Released)