ABOARD XIANGYANGHONG 09, Jan. 3, 2015 (Xinhua) -- China's deep sea manned submersible Jiaolong collects samples on a hydrothermal vent in the Indian Ocean, Jan. 2, 2015. Jiaolong carried out the first dive on a mission to study active hydrothermal vent in the southwestern Indian Ocean on Jan. 2. It was the first time for the submersible to take the second batch of pilot trainees in the diving, which was intended to enable the trainees to learn some skills of submersible operation in active hydrothermal vent and collect samples of hydrothermal fluid, sulfide, rocks, sediment and water.

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