The submarine hull number No. 361 named The Great Wall #61 (长城61号) was a Chinese People's Liberation Army Navy Type-035AIP conventional diesel/electric submarine. In April 2003, during an exercise in the Yellow Sea between North Korea and China's Shandong Province, the vessel suffered a mechanical failure that killed all 70 crew members on board. It was one of China's worst peacetime military disasters. The PLA Navy's Commander Shi Yunsheng and Political Commissar Yang Huaiqing were both dismissed as a result of the accident.