China black sea

Submersible Jiaolong returns from the ocean on Monday, July 16, 2012 om Qingdao, Shandong Province of China. The submersible reached a record depth of 7,062 meters in June in the Mariana Trench in the western Pacific Ocean. Jiaolong returned in glory from a six-week mission to its home port and received new orders for another research dive. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)