China nuclear sub sank in its dock, US officials say BBC.comExclusive | China’s Newest Nuclear Submarine Sank, Setting Back Its Military Modernization The Wall Street JournalGuess Where the Possibly Nuclear-Fuel-Leaking Sunken Chinese Submarine Is? National ReviewChina’s most advanced nuclear submarine sank in shipyard, says US Financial TimesChina’s newest nuclear submarine sank in dock, US officials confirm The Guardian