The Virginia-class fast-attack submarine USS North Carolina (SSN 777) enters Dry Dock 1 at Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility (PHNSY & IMF) Sept. 4, 2024. North Carolina is at the shipyard for its Depot Modernization Period, where the shipyard project team and ship's crew will give the vessel its scheduled maintenance upgrades and makeover. PHNSY & IMF's mission is to repair, maintain, and modernize Navy fast-attack submarines and surface ships, in order to keep the Navy's fleet "Fit to Fight." (U.S. Navy photo by Justice Vannatta)