According to Wikipedia: "The 6,500-ton Type 092 Daqingyu (United States Department of Defense designation Xia-class, Chinese designation 09-II) submarine was the first ballistic missile-carrying, nuclear-powered submarine class (SSBN) deployed by the Chinese People's Liberation Army Navy, and the first SSBN designed and built in Asia. She was designed by Peng Shilu and Huang Xuhua and derived from the Han-Class SSNs, with an extended hull to accommodate twelve missile tubes."