Feng Dong, a researcher from the South China Sea Institute of Oceanology of Chinese Academy of Sciences, prepares to board China's manned submersible Jiaolong for a deep-sea dive into the South China Sea, July 5, 2013. The Jiaolong manned submersible on Friday carried out a scientific dive to collect rock samples from the Jiaolong Seamount in the South China Sea. (Xinhua/Zhang Xudong)

China's manned submersible Jiaolong is hoisted by its support ship Xiangyanghong 09 in the South China Sea, July 5, 2013. The Jiaolong manned submersible on Friday carried out a scientific dive to collect rock samples from the Jiaolong Seamount in the South China Sea. (Xinhua/Zhang Xudong)

Working staff untie the rope on the China's manned submersible Jiaolong in the south China Sea, July 5, 2013. The Jiaolong manned submersible on Friday carried out a scientific dive to collect rock samples from the Jiaolong Seamount in the South China Sea. (Xinhua/Zhang Xudong)

China's manned submersible Jiaolong dives into the south China Sea, July 5, 2013. The Jiaolong manned submersible on Friday carried out a scientific dive to collect rock samples from the Jiaolong Seamount in the South China Sea. (Xinhua/Zhang Xudong)