Submarine Maintenance Delays Cost Navy $3.4 Billion and 15,000 Operational Days, GAO Finds

When discussing naval readiness, the public imagination often defaults to a shortage of advanced weaponry or a lack of funding for new hulls. The reality, however, is far more mundane and significantly more expensive: a lack of dry dock space. Over the past decade, the United States Navy has lost more than 15,000 operational days—the equivalent of removing multiple attack submarines from the fleet entirely—simply because vessels are stuck waiting for maintenance or decommissioning. According to a newly declassified Government Accountability Office (GAO) report, these delays have cost taxpayers $3.4 billion since 2016 to sustain fully crewed submarines that cannot deploy.[1][2]

The core bottleneck lies in the Navy's infrastructure chain. Maintenance for the fleet of 44 Los Angeles-class and Virginia-class nuclear attack submarines is performed at just four public shipyards: Portsmouth Naval Shipyard in Maine, Norfolk Naval Shipyard in Virginia, Puget Sound Naval Shipyard in Washington, and Pearl Harbor Naval Shipyard in Hawaii. These facilities were largely designed for a different era of naval operations and are currently struggling to handle the volume and complexity of the modern nuclear fleet.[2]

When these four shipyards reach capacity, submarines are forced into what the military terms "active idle time." Submarines operate under strict safety parameters, including dive certifications that dictate how long a vessel can safely submerge before requiring comprehensive depot-level maintenance. Once that certification expires, the submarine is legally and operationally barred from conducting normal missions.[1][2]

During active idle time, the submarine remains tied to a pier. It cannot deploy, it cannot dive, and it cannot contribute to the global combatant commanders' requirements. Yet, because it is still an active commissioned warship with a live nuclear reactor, it must remain fully crewed with highly trained sailors. This creates a scenario where the military is paying premium operational costs for an asset that is effectively paralyzed.[1][2]

The financial drain of this waiting period is substantial and meticulously quantified in the GAO's audit. For an older Los Angeles-class submarine, active idle time costs the Navy approximately $220,000 per day in operating and support expenses. For the newer, more complex Virginia-class vessels, that figure rises to more than $237,000 per day. Over the 2016 to 2025 period, these daily expenditures compounded into billions of dollars for zero operational return.[2]

While the Navy has made some recent, acknowledged progress in reducing active idle time for operational vessels, the GAO warns that a secondary, potentially more costly crisis is emerging at the other end of the submarine lifecycle. "Inactive idle time"—the period when a submarine is designated for decommissioning but cannot be inducted into a dry dock—is growing rapidly.[1][2]

Decommissioning a nuclear submarine is not as simple as turning off the engines and towing the hull to a scrapyard. The process requires specialized dry dock facilities to safely defuel the nuclear reactor, remove sensitive classified equipment, and dismantle the hull. Because shipyards lack the capacity to begin this complex process, older submarines are left languishing pier-side for years after their operational lives have ended.[2][3]

The USS Pasadena serves as the GAO's primary case study for this systemic failure. The Los Angeles-class submarine entered inactive status on January 1, 2025, to begin its retirement. However, due to severe shipyard constraints, the actual decommissioning process is not expected to commence until November 15, 2028.[1][2]

For nearly four years, the Pasadena will remain fully crewed with sailors while unable to dive or deploy. Navy officials have attempted to mitigate the inefficiency by using the vessel as a static training platform for junior submariners while it waits. Yet, the GAO estimates this single extended delay will cost the Navy over $300 million in operating and support costs over its inactive period.[1][2]

The broader mathematical trajectory for the decommissioning backlog remains unsustainable. As the Cold War-era Los Angeles-class submarines reach the end of their service lives in large numbers, the bottleneck will tighten. The watchdog agency projects that without immediate intervention, 15 attack submarines will enter inactive idle time between fiscal years 2026 and 2030.[1][2]

This impending wave of retirements would result in an additional 14,000 days of lost time. More critically, it would incur another $3.1 billion in operating costs to sustain vessels that will never sail again. In other words, the Navy is on track to spend nearly as much on idle retiring submarines in the next five years as it spent on all idle submarines over the past decade.[1][2]

The strategic consequences extend far beyond wasted capital. Every dry dock occupied by a submarine awaiting decommissioning is a dry dock unavailable for repairing an active vessel. This circular dependency creates a compounding readiness deficit. Furthermore, keeping full crews assigned to inactive submarines exacerbates the Navy's ongoing personnel shortages, trapping specialized nuclear technicians on pier-side duty rather than deploying them to the active fleet.[2][3]

To break the cycle, the GAO issued two primary recommendations aimed at the Naval Sea Systems Command. First, the Navy must fully evaluate alternative decommissioning options. The most prominent alternative involves defueling nuclear reactors outside of traditional dry docks, which would bypass the primary infrastructure bottleneck and allow the hulls to be processed more rapidly.[2]

Second, the agency recommended developing a comprehensive implementation plan to reduce crew requirements for submarines awaiting retirement. By safely drawing down the number of sailors required to monitor an inactive reactor, the Navy could save millions in personnel costs and reallocate those sailors to active Virginia-class boats that desperately need experienced operators.[2]

The Navy verbally concurred with the GAO's recommendations, acknowledging the severity of the backlog, though it declined to provide written comments for the public version of the report. The challenge now shifts from diagnosing the bottleneck to executing a structural overhaul of how the military manages the end-of-life phase for its most complex maritime assets.[2]

Ultimately, the submarine maintenance crisis highlights a fundamental tension in modern defense planning. While procurement budgets often focus on acquiring the next generation of stealth technology and strike capabilities, the unglamorous logistics of dry docks, defueling procedures, and shipyard workforce capacity dictate the actual size and readiness of the fleet. Until those foundational infrastructure issues are resolved, the Navy will continue to pay a premium simply to wait in line.[3]