Photo taken on July 15, 2016 shows a hangar of the "Zhang Jian", a Chinese deep-sea explorer ship. The ship, 97 meters long and 17.8 meters wide, set sail on July 12 from Shanghai to the South Pacific for scientific research. It's the mother ship of the 11,000-meter Rainbow Fish submersible, which Chinese researchers are preparing to send to the Mariana Trench late this year or early next year. [Xinhua]

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