China’s Newest Nuclear Submarine Sank, Setting Back Its Military Modernization

China’s newest nuclear-powered attack submarine sank in the spring, a major setback for one of the country’s priority weapons programs, U.S. officials said.

The episode, which Chinese authorities scrambled to cover up and hasn’t previously been disclosed, occurred at a shipyard near Wuhan in late May or early June.

It comes as China has been pushing to expand its navy, including its fleet of nuclear-powered submarines.

The Pentagon has cast China as its principal long-term “pacing challenge,” and U.S. officials say that Beijing has been using political and military pressure to try to coerce Taiwan, a separately governed island that Beijing claims as part of its territory.

China says its goal in building a world-class military is to deter aggression and safeguard its overseas interests. A spokesman for the Chinese embassy didn’t immediately respond to a request for comment.

The U.S. doesn’t know if the sub was carrying nuclear fuel at the time it sank, but experts outside the U.S. government said that was likely.

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