Crew members of submersible Jiaolong Liu Shiping, Tang Jialing and Liu Xiaohui (L to R) wave after a dive in the Mariana Trench on May 23, 2017. China's manned submersible Jiaolong finished a dive in "Challenger Deep" in the Mariana Trench, the world's deepest known trench, on Tuesday. Xinhua News Agency journalist Liu Shiping descended inside the submersible along with scientists to 4,811 meters below the sea's surface. (Xinhua/Xu Weikun)
