Oceanaut Liu Kaizhou waves before the start of the fourth dive of Jiaolong, China's manned submersible, in the Mariana Trench, on June 24, 2012. China's manned submersible, Jiaolong, made its fourth dive in the Mariana Trench on Sunday morning to attempt the world's first 7,000-meter dive below the surface of the Pacific Ocean. [Xinhua] |
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