Photo taken on May 15, 2018 shows cold water coral on the Ganquan plateau in the South China Sea. Scientists descending inside China's manned submersible Shenhai Yongshi (Deep Sea Warrior) discovered cold water coral on the Ganquan plateau for the first time. (Xinhua/Zhang Jiansong)

Photo taken on May 15, 2018 shows cold water coral on the Ganquan plateau in the South China Sea. Scientists descending inside China's manned submersible Shenhai Yongshi (Deep Sea Warrior) discovered cold water coral on the Ganquan plateau for the first time. (Xinhua/Zhang Jiansong)

Photo taken on May 15, 2018 shows cold water coral on the Ganquan plateau in the South China Sea. Scientists descending inside China's manned submersible Shenhai Yongshi (Deep Sea Warrior) discovered cold water coral on the Ganquan plateau for the first time. (Xinhua/Zhang Jiansong)

Photo taken on May 15, 2018 shows cold water coral on the Ganquan plateau in the South China Sea. Scientists descending inside China's manned submersible Shenhai Yongshi (Deep Sea Warrior) discovered cold water coral on the Ganquan plateau for the first time. (Xinhua/Zhang Jiansong)

Photo taken on May 15, 2018 shows cold water coral on the Ganquan plateau in the South China Sea. Scientists descending inside China's manned submersible Shenhai Yongshi (Deep Sea Warrior) discovered cold water coral on the Ganquan plateau for the first time. (Xinhua/Zhang Jiansong)