DEEP DOWN: Crew members aboard China's Haiyang-6 research vessel retrieve a surveying device from the Pacific Ocean on June 11, in preparation for dive attempts by the country's deep-sea submersible, the Jiaolong, at the Mariana Trench between mid-June and early July. The Jiaolong will attempt the world's deepest manned submersible dive by going 7,000 meters under the sea surface (ZHOU WENJIE)