180805-N-TW634-227 PACIFIC OCEAN (Aug. 5, 2018) Navy Diver 1st Class Collin Kelly, assigned to Undersea Rescue Command (URC), climbs down from the main compartment of URC�s pressurized rescue module (PRM) to dewater the PRM�s transfer skirt, 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)