China's research vessel finishes month-long deep sea exploration

Updated 2017-09-06 09:30:40 Xinhua

Chinese research vessel Kexue, carrying an underwater robot and an unmanned submersible, finished a month-long scientific exploration in the western Pacific Ocean Tuesday.

The ship docked in the city of Sannya in southernmost China's island province Hainan Tuesday.

It set off from Shenzhen on Aug. 7, traveled the South China Sea, and sailed to the Yap Trench for ecological and marine organism surveys.

Xu Kuidong, chief scientist on board the ship, said the researchers sent the unmanned submersible 15 times to Caroline Seamount, where no exploration had been made before, to collect 400 marine samples from 170 species.

They also found coral gardens and sponge forests in the area.

On the expedition, a piece of coral found 1,246 meters deep might be older than 4,200 years, the age of the oldest coral ever found. Researchers will do lab research to check its age, Xu said

The researchers believe that Caroline Seamount was once an island. It subsides by at least 1,500 meters during plate movements.

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