A diving instructor checks the growth of corals in the sea at the Fenjiezhou Island scenic area in Lingshui Li Autonomous County, south China's Hainan Province, Nov. 19, 2018. Apart from leading groups of tourists on underwater excursions, some 100 diving instructors here also volunteer to help with coral reefs maintenance activities, such as transplanting corals to the designated restoration areas. Now the coral coverage reaches 13.16 percent at the scenic area and 30 percent to 40 percent at the diving area. (Xinhua/Yang Guanyu)