180805-N-TW634-272 PACIFIC OCEAN (Aug. 5, 2018) Chilean Cmdr. Federico Karl Saelzer Concha, commanding officer of the Chilean Submarine (CS) Simpson (SS 21), climbs into the pressurized rescue module (PRM) of Undersea Rescue Command (URC) 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)