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China's unmanned submersible Qianlong 3 to conduct first dive
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China's self-developed 4,500-meter-level unmanned submersible Qianglong 3 will conduct its first dive in the South China Sea on Friday.
Xinhua丨Updated: April 20, 2018
A photo taken on Dayang Yihao in Xiamen, East China's Fujian province, on April 15, 2018. [Photo/Xinhua]