Jiaolong, China's manned submersible, on Tuesday descended to 3,117 meters below sea level while operating in the northwestern Indian Ocean.
The operation marked the 38th ocean scientific expedition by a Chinese team, and Jiaolong's first deep-sea exploration of the year.
Yu Hongjun, field commander of the mission, said the expedition fully tested the system, and collected a variety of samples including 4.2 kg of sulfide, 18.7 kg of basalt and 16 liters of deep-sea water.
Han Xiqiu, one of the scientists on the expedition, said future dives will evaluate the resource potential of the area.
During the 124-day voyage, the Jiaolong submersible will also explore the South China Sea and Yap Trench.
Named after a mythical dragon, Jiaolong reached its deepest depth of 7,062 meters in the Mariana Trench in June 2012. (Xinhua)
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