191102-N-HH853-0013 KEYPORT, Wash. (Nov. 2, 2019) Rear Adm. Douglas Perry, commander of Submarine Group 9, speaks about the nuclear research submarine, NR-1, during Deep Sea Day at the United States Naval Undersea Museum (USNUM). USNUM is dedicated to educating the public about the U.S. Navy’s undersea operations, technology, combat, research, and salvage operations. (U.S. Navy photo by Mass Communication Specialist 3rd Class Emilia Hilliard/Released)