Rescuers try to put out fire of a fishing vessel sailing six nautical miles off the coast of Wenchang, south China's Hainan Province, Aug. 17, 2015. One fisherman was trapped inside the engine cabin, and at least four fishermen fell into the sea and have yet to be found after a fire-triggered explosion on the fishing vessel off the coast of Hainan on Monday. (Xinhua/Zhang Junzi)