Visitors take photos of Jiaolong, China's manned submersible, on Xiangyanghong-9 ship in Qingdao, a coastal city of Shandong province, July 16, 2012. China's manned submersible Jiaolong has successfully completed its program of deep sea dives, with a sixth and final dive to 7,000 meters in the Mariana Trench in the Pacific Ocean on June 30. [cankaoxiaoxi.com]