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Building the Shipyards the Nation Needs

The Navy's four public shipyards -- Norfolk Naval Shipyard (NNSY), Portsmouth Naval Shipyard (PNSY), Puget Sound Naval Shipyard and Intermediate Maintenance Facility (PSNS&IMF), and Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility (PHNSY&IMF) --  perform a vital role in national defense by executing maintenance on submarines and aircraft carriers in order to provide combat-ready ships to the fleet.

Originally designed and built in the 19th and 20th centuries to build sail- and conventionally-powered ships, the Navy's public shipyards are not efficiently configured to maintain and modernize nuclear-powered aircraft carriers and submarines. With the Navy's needed focus on operations, the aging shipyards have been unable to adequately sustain and optimize their facilities, utilities, dry docks, equipment and information technology infrastructure. These inefficiencies and obsolete facilities result in higher maintenance costs, schedule risks and reliability issues.

To create the shipyards that our nation needs requires making significant investments to modernize dry docks, optimize industrial processes and modernize standard equipment to bring these critical industrial sites to modern standards.

The Navy established the Shipyard Infrastructure Optimization Program (SIOP) program office in May 2018. SIOP is a centrally-managed program led by Naval Sea Systems Command (NAVSEA), with support from Naval Facilities Engineering Command (NAVFAC) and Commander, Navy Installations Command (CNIC). NAVSEA is the operating agent and the technical authority for all four shipyards, executing the capital equipment program while NAVFAC provides facilities engineering and construction programs, supports environmental and compliance requirements and retains head-of-contracting-activity authority for facilities and dry dock investments. CNIC is the Navy's shore integrator and directs the Navy's shore environmental program.

The Navy will ensure that the optimization process fully integrates environmental considerations including natural and cultural resources, water and air quality, and more. During the development of individual shipyard plans, the Navy will develop alternatives for assessment under the National Environmental Policy Act (NEPA), Endangered Species Act (ESA) and the National Historic Preservation Act (NHPA). The Navy will work with stakeholders as part of the decision-making process and will conduct all appropriate NEPA, natural resource and NHPA analyses; agency and government-to-government consultations and public engagement and obtain all required permits to ensure a proactive approach to environmental protection.


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Navy Shipyards



Shipyard News

Pearl Harbor Naval Shipyard wraps up dry dock phase of North Carolina Maintenance
The Virginia-class fast-attack submarine USS North Carolina (SSN 777) transits the waters of Pearl Harbor to the piers following a successful undocking evolution at Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility (PHNSY & IMF) in Pearl Harbor, Hawaii, Aug. 12, 2026. The submarine shifted to a pier-side location to continue its operational preparations after completing dry dock maintenance. 

North Carolina was commissioned May 3, 2008. North Carolina is the fourth Virginia-class submarine and the fourth U.S. Navy ship to be named for the Tar Heel state. North Carolina is assigned to Submarine Squadron 1 and capable of supporting various missions, including anti-submarine warfare, anti-surface ship warfare, strike warfare, special operations support, and intelligence, surveillance, and reconnaissance.

PHNSY & IMF’s mission is to keep the Navy’s fleet “Fit to Fight” by repairing, maintaining, and modernizing the Navy's fast-attack submarines and surface ships. Strategically located in the heart of the Pacific, it is the most comprehensive fleet repair and maintenance facility between the U.S. West Coast and the Far East. (U.S. Navy photo by Camey Streff)
Aug. 12, 2026 - Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility (PHNSY & IMF) successfully undocked Virginia-class fast-attack submarine USS North Carolina (SSN 777), Aug. 12, 2026, clearing a critical benchmark in the...

PHNSY & IMF, HCC partner to showcase shipyard careers at Submarine Museum
A Honolulu Community College summer academy student participates in a hands-on demonstration hosted by Pearl Harbor Naval Shipyard & Intermediate Maintenance Facility during a mini-trades fair at the Pacific Fleet Submarine Museum on July 15, 2026. PHNSY & IMF’s STEM program participated in the HCC Summer CTE Academy event at the museum, conducting a mini-career fair for more than 100 students from the Academy, providing real-world shop exposure to students expressing an interest in trades, engineering, and STEM. PHNSY & IMF’s mission is to keep the Navy’s fleet “Fit to Fight
Aug. 12, 2026 - It was a hot, bustling day at the Pacific Fleet Submarine Museum at Pearl Harbor. A recent ribbon-cutting for a new exhibit highlighted Pearl Harbor Naval Shipyard's more than 100-year history of submarine contributions. This...

USS Illinois successfully undocks at Pearl Harbor Naval Shipyard
Virginia-class fast-attack submarine USS Illinois (SSN 786) leaves Dry Dock 2 at Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility (PHNSY & IMF), June 24, 2026, completing an important milestone in the submarine’s scheduled lifecycle maintenance period. Commissioned Oct. 29, 2016, Illinois is the 13th Virginia-class submarine. It is the second U.S. Navy ship to be named for the state of Illinois. Illinois is assigned to Submarine Squadron 1 and is capable of supporting various missions, including anti-submarine warfare; anti-surface ship warfare; strike warfare; special operations forces support; and intelligence, surveillance, and reconnaissance. PHNSY & IMF’s mission is to keep the Navy’s fleet “Fit to Fight
July 7, 2026 - Pearl Harbor Naval Shipyard and Intermediate Maintenance Facility (PHNSY & IMF) successfully undocked Virginia-class fast-attack submarine USS Illinois (SSN 786), June 24, 2026, completing an important milestone in the...