"ZHANG JIAN" SHIP, July 12, 2016 (Xinhua) -- Staff members of the "Zhang Jian", a Chinese deep-sea explorer ship, conduct a fire and life-saving drill on the "Zhang Jian" ship, July 12, 2016. The ship set sail on Tuesday 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/Zhang Jiansong)