180314-N-ON977-0170 APRA HARBOR, Guam (March 14, 2018) Dr. Lee Shannon, left, a marine ecologist with the Naval Facilities Engineering Command Engineering and Expeditionary Warfare Center, signals to Navy Diver 2nd Class Nicholas Barcia-Dimeo, assigned to the Naval Base Guam Dive Locker, as they ascend at the end of a dive in Apra Harbor. (U.S. Navy photo by Mass Communication Specialist 2nd Class Alfred A. Coffield/Released)