A satellite image shows floating cranes near a pier at a Chinese shipyard.
Efforts to salvage the submarine, June 15.
  • One of China's newest attack submarines sank at a shipyard in Wuhan.
  • Satellite images show China's efforts to salvage the nuclear-powered vessel.
  • China's shipbuilding industry is massive and at the core of its naval modernization efforts.

One of China's newest nuclear-powered attack submarines sank in a Wuhan shipyard, a US official told Business Insider, confirming earlier reporting.