China's Mengxiang drillship sets national depth record, retrieves South China Sea basalt cores

China's deep-ocean drilling ship Mengxiang completed its first expedition in the South China Sea, setting a national depth record and retrieving basalt core samples. The samples could help unravel the region's tectonic history, and the voyage tested the capabilities of the world's most powerful deep-ocean drilling ship. The scientific value is significant, but the geopolitical implications of China's expanding deep-sea research capabilities in contested waters are also notable.