Photo taken on Sept. 3, 2013 shows the rocks and leptasteria collected by China's manned submersible Jiaolong during its 69th diving of scientific research in the Pacific. Jiaolong and its support ship the Xiangyanghong-09 are on a scientific research voyage focusing on polymetallic nodules in the northeast Pacific and cobalt-rich crusts in the northwest Pacific. (Xinhua/Yu Xiaojie)