Chinese submersible Jiaolong completes 20th dive in Mariana Trench

 

China's manned submersible "Jiaolong" is retrieved after its dive in the Mariana Trench, June 1, 2017. Jiaolong Thursday conducted its 20th dive in the Mariana Trench, the world's deepest-known trench, since 2012. (Xinhua/Liu Shiping)