The Pentagon now estimates that China will field 65 submarines by the end of this year, a total that sits just six boats below the 71 the U.S. Navy operates worldwide. That narrowing gap, documented in the Defense Department’s 2024 China Military Power Report, has sharpened a debate in Washington over whether American shipyards can build fast enough to stay ahead of a rival that adds hulls at a steady clip while the U.S. fleet contends with production delays and aging boats.
Why a 65-boat Chinese submarine fleet changes the calculus
The comparison between 65 and 71 is not a simple scoreboard. The U.S. Navy spreads its submarines across the Atlantic, the Pacific, the Indian Ocean, and the Arctic. China concentrates its fleet in the Western Pacific, where any conflict over Taiwan or the South China Sea would play out. That geographic math means the People’s Liberation Army Navy can mass a higher share of its boats in a single theater than the United States can on short notice.
Senior defense officials have pushed back against raw number-to-number comparisons. During a Pentagon briefing on the 2024 China Military Power Report, a senior defense official stressed that quality, readiness, and operating concepts also shape the balance, cautioning that “numbers aren’t the whole story.” That framing, though, has not quieted lawmakers who see the shrinking margin as a warning sign for U.S. industrial capacity.
If China sustains production above 60 hulls and continues adding both diesel-electric and nuclear-powered boats, the political pressure in Congress will likely shift. Rather than fixating on total fleet size, appropriators may begin asking harder questions about how many weapons the existing fleet can carry into contested waters and whether the Navy has enough protected undersea magazine capacity to fight a prolonged campaign. That shift could reshape procurement priorities within two budget cycles, redirecting money from platform counts toward weapons stockpiles, maintenance throughput, and forward-deployed munitions storage.
Geography and alliance structure further complicate the picture. The United States must allocate submarines to deter Russia, support operations in the Middle East, and fulfill commitments to NATO and other partners. China, by contrast, can focus almost entirely on its near seas. Even if the U.S. retains a numerical edge on paper, the number of American attack submarines actually available to surge into the Western Pacific in a crisis is smaller than the global total suggests.
At the same time, U.S. boats generally carry more advanced sensors, communications gear, and long-range weapons than their Chinese counterparts. That qualitative advantage is central to the Pentagon’s argument that a simple tally of hulls obscures more than it reveals. However, an advantage in capability does not erase the operational strain that comes from a tight margin in numbers, particularly if a conflict demanded sustained operations over months rather than days or weeks.
Pentagon data and congressional research behind the fleet count
The 65-boat projection comes from the Defense Department’s annual China Military Power Report, formally known as the CMPR. The report tracks PLAN force structure across ship classes, and the 2024 edition placed the submarine fleet on a trajectory that brings it within single digits of the U.S. total. The Pentagon transcript associated with the report is the most direct public record of how officials framed that estimate, including the caveats they attached to it.
On the American side, the Congressional Research Service provides recurring analysis of China’s naval modernization alongside U.S. Navy force-structure and shipbuilding plans. Cataloged as RL33153, the report compiles procurement rates, industrial-base constraints, and delivery timelines for American attack submarines. It gives lawmakers an independent, nonpartisan baseline for judging whether the Navy’s own build plan can keep pace with the threat trends highlighted in the CMPR.
Together, these two documents form the evidentiary backbone of the current debate. The CMPR supplies the threat picture; the CRS report supplies the capacity picture. When read side by side, they show a trajectory where China’s fleet grows while U.S. shipyards struggle to deliver new Virginia-class boats on schedule. The CRS analysis has repeatedly flagged persistent delays in the submarine industrial base, a problem rooted in workforce shortages, supplier bottlenecks, and aging infrastructure at the two yards that build nuclear submarines.
Lawmakers tracking the CRS data have questioned whether current U.S. production rates can keep pace with China’s steady additions. The concern is not abstract. Every year a new American attack submarine slips behind schedule, the gap between 71 and 65 risks closing further, not because China is surging but because the U.S. side is falling behind its own plans. That dynamic has already influenced hearings on shipbuilding and could shape the markup process for future defense authorization and appropriations bills.
Unanswered questions about fleet quality and readiness
The public record leaves several important questions open. The 2024 CMPR does not release monthly or quarterly commissioning data from Chinese shipyards, so outside analysts cannot track exactly when each new hull enters service. That makes it difficult to judge whether the 65-boat estimate reflects boats already in the water or includes hulls expected to commission before year’s end.
On the U.S. side, the CRS summary does not break out specific delivery delays by hull number. Observers know that Virginia-class construction has slipped, but the precise extent of each delay and the knock-on effects for the overall fleet schedule are not detailed in the publicly available version of the report. Without those granular numbers, it is hard to model when the U.S. submarine fleet might begin growing again rather than holding steady or shrinking as older Los Angeles-class boats retire.
Operational tempo data is another blind spot. Neither the CMPR materials nor the CRS report includes direct statements from fleet commanders about current patrol rates or maintenance backlogs. Submarine availability, the share of the fleet that is actually deployable on any given day, matters as much as the total count. A fleet of 71 boats with a third in extended maintenance offers a very different picture than 65 boats with higher availability rates.
There are also unresolved questions about training and crew experience. The Pentagon’s public assessments have described Chinese submarine crews as improving, but the CMPR does not provide detailed metrics on proficiency or time at sea. For U.S. forces, the unclassified CRS analysis focuses on hardware and industrial capacity rather than crew readiness. That leaves analysts to infer undersea training intensity from broader budget lines and exercises, rather than from hard data.
What the numbers could mean for future U.S. strategy
As Congress turns to building future defense budgets, the 65-boat figure is likely to feature in arguments for both more ships and more weapons. Advocates for expanding the industrial base will point to the narrowing gap as evidence that current production goals are insufficient. Others may argue that the priority should be ensuring each existing submarine is fully armed, maintained, and supported, even if that means accepting a slower pace of fleet growth.
Either way, the combination of CMPR threat projections and CRS capacity analysis has moved the submarine discussion beyond abstract theory. The numbers now point to a concrete challenge: a world in which the United States no longer enjoys a comfortable undersea margin in the Western Pacific and must decide how to allocate finite shipbuilding dollars in response.
Those decisions will unfold over years, not months. But the Pentagon’s 65-boat estimate has already reframed the debate, forcing policymakers to grapple with the reality that industrial capacity, not just strategy, will shape the future balance of power beneath the waves.
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*This article was researched with the help of AI, with human editors creating the final content.
