China’s unmanned submersible reached a depth of 10,767 meters, setting a new national record, the Chinese Academy of Sciences (CAS) said. Haidou-1 set the record at the Mariana Trench in the West Pacific, the deepest ocean area in the world, during a scientific expedition lasting from June 22 to August 12. China is the third country after Japan and the United States to have built submersibles capable of reaching depths in excess of 10,000 meters.