On June 27, 2012, the Jiaolong with two oceanauts reached a depth of 7,062 meters (23,169 feet) in the Mariana Trench in the western Pacific Ocean.[1] Previously on June 19, 2012, the Jiaolong reached a depth of 6,965 metres (22,851 feet).[2] It had its first test in South China Sea between May 31 and July 18, 2010, reaching a depth of 3,759 metres (12,333 ft) with three crew.[3] On July 22, 2011, Jiaolong reached a depth of 4,027.31 metres (13,213.0 ft) in northeastern Pacific. The five-hour mission included chemical, physical and biological research. 17 dives have been completed.[4][5]