Photo taken on Oct. 4, 2015 shows the Kaogu 01 ship conducting underwater archaeological studies in Dandong, northeast China's Liaoning Province. "Dandong No.1", a shipwreck discovered last year near Dandong Port, has been confirmed as cruiser Zhiyuan, one of the warships of the Beiyang Fleet sunk by the Japanese navy during the first Sino-Japanese War 121 years ago.(Xinhua/Chen Yichen)