Navy warns China’s nuclear capabilities could threaten large portions of the United States

The U.S. Navy is publicly warning that China’s rapidly expanding fleet of nuclear-armed submarines could soon bring large portions of the United States within credible strike range. Senior officers describe a shift from a mostly regional challenge in the western Pacific to a maturing global threat that could reach American cities from protected waters near China’s own coast.

Driving the alarm is a combination of quantity, technology, and geography: more Chinese nuclear submarines, better reactors and sensors, and longer-range missiles that allow those boats to stay closer to home while still targeting the continental United States. Taken together, these trends are forcing Washington to rethink how it protects the homeland and deters Beijing at sea.

From regional rival to nuclear peer at sea

U.S. naval leaders now frame China as a fast-rising undersea competitor that aims to erode American dominance beneath the waves by the 2030s and 2040s. In public remarks, admirals have warned that the United States still fields the edge in submarine quality, but that advantage is narrowing as Beijing pours resources into new yards, advanced propulsion, and sophisticated sensors. One senior officer used the Los Angeles-class fast-attack submarine USS Asheville as a symbol of the high-end American fleet that China is trying to match, stressing that keeping that lead will require sustained investment in undersea defense as a top priority for the United States, according to undersea defense.

The change involves not only the size of China’s submarine force but its mission. Where Chinese boats once focused largely on coastal defense and regional deterrence, U.S. officials now describe a fleet that is being built for global reach and persistent nuclear patrols. A recent warning highlighted a surge of advanced nuclear-powered submarines entering service, with the Navy describing a rapid expansion of Chinese platforms equipped with undersea and nuclear upgrades that are designed to challenge U.S. operations far from Asia, a trend captured in assessments of a growing Chinese submarine surge.

Production surge and the 70 and 80 boat benchmarks

The most immediate concern for planners is the sheer pace of Chinese submarine production. Intelligence shared with Congress and public audiences describes how the Chinese People’s Liberation Army Navy has dramatically increased output of advanced nuclear-armed submarines, supported by upgraded infrastructure at major shipyards. Imagery and assessments from naval parades near Qingdao, China, have been used to illustrate how quickly new hulls are joining the fleet and how modern their designs appear, with analysts highlighting a new generation of quieter boats that carry longer-range ballistic missiles, as reflected in assessments of advanced nuclear-armed subs.

U.S. officials have attached specific figures to that growth. One Navy assessment projects that by next year China’s submarine force will reach roughly 70 submarines in total, with a rising share of those boats powered by nuclear reactors and configured for strategic missions. Looking further ahead, Pentagon projections estimate that by 2035 the fleet could grow to about 80 submarines, roughly half of them nuclear-powered. That trajectory, U.S. planners argue, would give Beijing a sustained at-sea nuclear presence and the ability to maintain multiple ballistic missile submarines on patrol at any given time.

How Chinese subs could reach “large portions” of the United States

American concern is not just about how many submarines China fields, but how far those boats can now threaten. Senior U.S. naval officials have warned that new Chinese ballistic missile submarines, armed with longer-range missiles, could soon hold large portions of the continental United States at risk without ever leaving waters close to China’s own coastline. In testimony and public briefings, they have described a scenario in which submarines on patrol in so-called protected waters near China could still target U.S. cities, effectively extending Beijing’s nuclear reach across the Pacific while keeping its boats under the cover of Chinese air and naval defenses, a scenario highlighted in warnings that extend nuclear reach.

Public-facing coverage has translated that strategic language into blunt terms for domestic audiences. One widely shared report summarized the Navy’s message as a warning that China could soon strike “Large Portions Of The United States With Nuclear Submarines,” framing the risk in terms that resonate from New York to California. That same account noted how the Navy’s concern is not abstract, but tied to specific advances in missile range and submarine stealth that allow Chinese boats to approach or even bypass traditional U.S. early warning networks, a point captured in descriptions that the Navy Warns China.

Inside the new Chinese boats: reactors, sensors and survivability

Behind the broad numbers are technical changes that make each new submarine more dangerous than the last. U.S. assessments describe how the Chinese Navy has “dramatically” increased submarine production while improving reactor design, sensor suites, and quieting techniques. Better reactors extend the time nuclear-powered boats can stay submerged, while modern sonar and combat systems improve their ability to detect and track adversaries. These upgrades, combined with new construction methods and acoustic treatments, are intended to produce a more survivable fleet that is harder for U.S. forces to find and monitor, according to analysis that the Chinese Navy has dramatically increased submarine production.

Officials also point to a broader ecosystem of military-industrial investment that supports this effort. Chinese yards are adding new assembly halls and piers, while research institutes work on next-generation propulsion and underwater communications. External corporate documentation tied to these efforts, including references that were discovered in connection with China Boosts Output, underscores how deeply Beijing is embedding submarine development into its long-term defense planning. For Washington, the combination of industrial scale and rising technical sophistication suggests that each future class of Chinese submarine will be quieter, more capable, and better integrated into a global surveillance and strike network.

U.S. response: undersea investment and public alarm

The United States is not standing still in the face of this challenge. Senior officers have called for renewed investment in attack submarines, undersea surveillance systems, and anti-submarine warfare training to ensure the U.S. Navy can still track and, if necessary, counter Chinese boats across the Pacific and beyond. They point to platforms like the Los Angeles-class USS Asheville as examples of the high-end capabilities that must be sustained and modernized, arguing that undersea dominance remains a core pillar of U.S. deterrence strategy and must be treated as a priority for the United States, a case made in detail in calls to invest in undersea.

At the same time, the Navy has taken the unusual step of speaking more plainly to the public about the stakes. Rear Admiral Mike Brooks, in testimony to the US China Economic and Security Review Commission, has been cited as sounding the alarm on China’s rapidly expanding submarine fleet and its nuclear implications for the American homeland. His warnings about a future in which Chinese submarines can credibly threaten U.S. cities from closer to home waters have been amplified by short video clips and social media, including a widely shared segment on Admiral Mike Brooksoutlining the danger. The goal, according to officials, is to build public understanding and political support for the costly and technically demanding work of sustaining undersea superiority in an era when China’s nuclear-armed submarines are no longer a distant or purely regional concern.