What satellite images reveal about China’s expanding nuclear programme

What satellite images reveal about China’s expanding nuclear programme

• Satellite images show rapid expansion at China's nuclear sites.
• New facilities in Sichuan may boost warhead production capacity.
• China's arsenal growth raises global arms control concerns.

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In the mist-covered valleys of southwest China, fresh satellite imagery shows significant expansion at several nuclear-related facilities. The images suggest that Beijing is accelerating efforts to modernize and enlarge its nuclear arsenal at a time of growing geopolitical rivalry.

One of the most closely watched locations is Zitong, in Sichuan Province. There, engineers have added bunkers, reinforced ramparts and new secured structures. A recently built complex features dense piping and other indicators associated with handling hazardous materials. Experts believe parts of the site may be used for testing high explosives, which are essential to triggering the implosion mechanism in nuclear warheads, the New York Times reported.

Pingtong and probable plutonium pit production

Another site, known as Pingtong, sits in a nearby valley behind double perimeter fencing. Analysts who have studied the imagery say the design and layout are consistent with facilities that manufacture plutonium “pits,” the metal cores at the heart of nuclear warheads.

The main building at Pingtong is marked by a 360-foot ventilation stack, along with visible heat-exchange and air-handling systems. Satellite comparisons from recent years show refurbishment work, new enclosures and ongoing construction. Above the facility entrance, a large slogan attributed to China’s leader, Xi Jinping, is visible from space.

Renny Babiarz, a geospatial intelligence analyst who has reviewed imagery and other visual data from these sites, said the changes fit a broader pattern. In his assessment, upgrades across multiple nuclear locations have accelerated since 2019. He described the expansion as part of a larger mosaic that, taken together, signals rapid growth.

A challenge for global arms control

China’s nuclear expansion comes at a difficult moment for arms control. The last remaining nuclear arms treaty between the United States and Russia has expired, and Washington has argued that any future framework must include China. Beijing has not shown interest in joining such agreements.

According to the Pentagon’s most recent estimate, China possessed more than 600 nuclear warheads by the end of 2024 and could reach 1,000 by 2030. Although that total would still trail the much larger stockpiles held by Washington and Moscow, analysts say the pace of growth is significant.

Thomas G. DiNanno, a senior U.S. State Department official responsible for arms control, recently accused China of conducting nuclear explosive tests in violation of a global moratorium. Beijing has denied the allegation, and experts remain divided over the strength of the evidence.

From Mao’s Third Front to renewed expansion

Many of the Sichuan facilities date back to the 1960s, when Mao Zedong launched the “Third Front” campaign. The initiative relocated strategic industries, including nuclear weapons production, deep into China’s interior to shield them from possible attacks by the United States or the Soviet Union.

After tensions with Washington and Moscow eased in the 1980s, several of these facilities were downsized or shuttered. Scientists often moved to research centres in Mianyang. For decades, China maintained what it described as a relatively modest nuclear deterrent, and changes at sites like Pingtong and Zitong were incremental.

That posture shifted roughly seven years ago. Analysts say construction has intensified not only in Sichuan but also at other nuclear-related installations, including a large laser ignition laboratory in Mianyang that could be used to simulate nuclear detonations without live tests.

Debate over intent and implications

Despite visible expansion, experts caution that satellite imagery alone cannot reveal precise production levels. Hui Zhang, a physicist who studies China’s nuclear programme, noted that while plant growth is evident, the number of warheads being produced remains unclear.

Some upgrades may reflect safety improvements or modifications tied to newer weapons systems, such as submarine-launched missiles. Others could indicate efforts to refine warhead designs through additional testing infrastructure.

For Washington, the concern extends beyond numbers. Analysts argue that a larger and more sophisticated arsenal could alter China’s calculations in a crisis, particularly over Taiwan. Michael S. Chase, a former US Defense Department official now at RAND, said Beijing may seek a position in which it believes it is less vulnerable to nuclear pressure from the United States during a conventional conflict.

As traditional arms control guardrails weaken, the steady expansion of China’s long-hidden mountain facilities adds another layer of uncertainty to the global nuclear landscape.