China's naval ambitions take a big hit: World's largest navy's new nuclear submarine sinks, satellite images confirm accident

China's latest nuclear-powered attack submarine sank earlier this year, according to a senior U.S. defense official. The incident raises questions about the PLA's training standards and equipment quality. Satellite images show cranes at the Wuchang shipyard, where the submarine was docked. China's embassy in Washington has not commented on the matter.