171121-N-CW570-0083 SANTA RITA, Guam (Nov. 21, 2017) U.S. Navy Construction Mechanic 2nd Class Tristan de Delva, assigned to Underwater Construction Team (UCT) 2, Construction Diving Detachment Alfa (CDDA), positions himself on a sinker and chain in preparation for underwater cutting operations on the Big Blue mooring system in Apra Harbor, Guam, Nov 21, 2017. UCT-2 provides construction, inspection, maintenance, and repair of underwater and waterfront facilities in support of the Pacific Fleet. (U.S. Navy photo by Mass Communication Specialist 1st Class Arthurgwain L. Marquez/Released)