180805-N-TW634-143 PACIFIC OCEAN (Aug. 5, 2018) Navy Diver 1st Class Michael Eckert, assigned to Undersea Rescue Command (URC), serves as the aft compartment controller for URC�s pressurized rescue module (PRM), as the PRM mates with the Chilean Submarine (CS) Simpson (SS 21) on the ocean floor during 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)