China's manned submersible Jiaolong prepares to dive into water in Jiangyin City, east China's Jiangsu Province, June 9, 2013. Jiaolong on Sunday carried out a drill for its voyage of experimental application. Photo: Xinhua

China's manned submersible Jiaolong dives into water in Jiangyin City, east China's Jiangsu Province, June 9, 2013. Jiaolong on Sunday carried out a drill for its voyage of experimental application. Photo: Xinhua 

China's manned submersible Jiaolong leaves the water in Jiangyin City, east China's Jiangsu Province, June 9, 2013. Jiaolong on Sunday carried out a drill for its voyage of experimental application. Photo: Xinhua 

China's manned submersible Jiaolong returns to its mother vessel Xiangyanghong 09 in Jiangyin City, east China's Jiangsu Province, June 9, 2013. Jiaolong on Sunday carried out a drill for its voyage of experimental application. Photo: Xinhua 

China's manned submersible Jiaolong dives into water in Jiangyin City, east China's Jiangsu Province, June 9, 2013. Jiaolong on Sunday carried out a drill for its voyage of experimental application. Photo: Xinhua