A diving coach searches for underwater litter at the Boundary Island Tourist Attraction in Lingshui County, south China's Hainan Province, July 20, 2019. Boundary Island in south China's Hainan Province is hosting its first series of diving-themed activities from July 19 to 21, attracting diving enthusiasts, tourists, marine ecologists and diving equipment dealers worldwide. The PADI (Professional Association of Diving Instructors) Women Dive Day event was also held here on Saturday alongside the main events. (Xinhua/Yang Guanyu)