Stretching nearly 30 kilometers, the world's longest cross-sea high-speed railway bridge over Hangzhou Bay in eastern China reached a key milestone on Friday when its first main tower was successfully topped out.

Once the bridge is operational, high-speed trains will be able to cross Hangzhou Bay in as little as around 10 minutes. The bridge will significantly enhance connectivity and support high-quality, integrated development across the Yangtze River Delta, one of China's most dynamic economic regions.