CHINA’S deep-sea manned submersible Fendouzhe(Striver)made national history on November 10,2020,when it descended 10,909 meters into the Mariana Trench in the western Pacific Ocean.Chinese President Xi Jinping sent a congratulatory letter marking the feat,in which he said the successful expedition showed China is capable of conducting scientific exploration and studies in the deepest depths of the ocean.For nearly two decades,scientists and engineers have had their own career intertwined with China’s deep-sea diving cause.Thanks to their dedication,China has witnessed considerable improvements in ocean-exploration craft from its first deep-sea manned submersible Jiaolong to Shenhai Yongshi(Deep Sea Warrior)whose key equipment was domestically produced,and the Fendouzhe which just concluded the new record-making mission.