<正>CHINA’s deep-sea manned research submersible, the Jiaolong, dived into the Mariana Trench six times between June 3 and July 16, 2012 to a maximum depth of 7,062 meters. The country now joins those in the select group, formerly comprising the U.S., Japan, France and Russia, possessing deep-sea manned submergence vessels capable of diving deeper than 3,500 meters.