Scientific researchers go aboard Xiangyanghong 09, carrier of China's manned deep-sea submersible Jiaolong, at its home port in Qingdao, east China's Shandong Province, Feb. 6, 2017. Jiaolong on Monday started a four-month scientific expedition to the northwest Indian Ocean, the Yap Trench and the Mariana Trench. (Xinhua/Zhang Xudong)
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