Li Jilong, deputy captain of the archaeology team for South China Sea, presents a piece of blue and white porcelain of Yuan Dynasty (1206-1368), in south China's Hainan province, June 1, 2010. After 35 days of underwater archaeological salvage work, the team discovered 32 underwater cultural relics and found blue and white porcelain of Yuan Dynasty in South China Sea for the first time. [Xinhua]