An aerial photo taken on Sept. 25, 2015 from a seaplane of Hainan Maritime Safety Administration shows the Yacheng 13-1 drilling rig during a patrol in South China Sea. Hainan Maritime Safety Administration launched a patrol on Sept. 25 in which seaplanes and cruising vessels both participated. The patrol focused on the environment of the cruise routes in southwestern sea area of south China's Hainan Province, condition of drilling rigs of Yangcheng 13-1 and Dongfang 1-1, and pollution state of adjacent sea area. (Xinhua/Zhao Yingquan)
