180805-N-TW634-157 PACIFIC OCEAN (Aug. 5, 2018) Navy Diver 1st Class Collin Kelly, assigned to Undersea Rescue Command (URC), opens the transfer skirt hatch of URC’s pressurized rescue module (PRM) after mating with the Chilean Submarine (CS) Simpson (SS 21) on the ocean floor, during the submarine rescue exercise CHILEMAR VIII. CHILEMAR VIII is a bilateral exercise designed to demonstrate interoperability between the U.S. submarine rescue systems and Chilean submarines. (U.S. Navy photo by Mass Communication Specialist 2nd Class Derek Harkins/Released)