The Shenzhen-Zhongshan Link, a mega cross-sea passage in south China featuring two bridges, two artificial islands and an underwater tunnel, opened to traffic at 3 p.m. on Sunday. Spanning 24 kilometers, the link drastically reduces travel time between the city of Zhongshan and the technology hub of Shenzhen on the opposite side of the Pearl River Estuary in Guangdong Province, cutting the duration of the trip from two hours to around 30 minutes.