China's manned submersible "Jiaolong" is despatched on its fifth, and last, dive of the year in the Mariana Trench, June 1, 2017. Jiaolong will descend to a depth of 6,700 meters. The mission is the third and final stage of China's 38th oceanic scientific expedition, which features surveys in the Yap and Mariana trenches. (Xinhua/Liu Shiping)
