Students of Southern University of Science and Technology visit China's manned submersible Jiaolong on its mother ship Xiangyanghong 09 at a port in Shenzhen, south China's Guangdong Province, May 13, 2017. Jiaolong returned to Shenzhen Saturday after the second stage of China's 38th ocean scientific expedition. The 38th oceanic scientific expedition started on Feb. 6. Jiaolong completed a dive in the northwestern Indian Ocean earlier this year in the mission's first stage. It will also conduct surveys in the Yap Trench and the Mariana Trench in the third stage. [Xinhua]