China possesses world-leading technologies in the fields of bridge engineering and tunnel engineering. The Hong Kong–Zhuhai–Macao (HZM) Bridge is a typical mega-project in China: With a total length of 55 km, it will be the longest sea-crossing bridge in the world. The main section of the HZM Bridge comprises a combined design of bridges with a total length of 22.9 km, two 100 000 m2 artificial islands, and an undersea tunnel that is 6.7 km long—the longest highway immersed tunnel in the world. The HZM tunnel is also the first deeply buried immersed tunnel in the world and the first offshore immersed tunnel constructed in China. Many breakthrough technologies were developed during its construction, including: a factory method for prefabricating 33 immersed tunnel elements including 5 curve element, ways of controlling settlement and sedimentation, risk-management techniques, and the mitigation of immersed tunnel element installation under offshore conditions. These advanced technologies ensure the highly efficient and safe construction of the HZM Bridge. When it successfully opens to traffic in 2018, the HZM Bridge will play a significant role in the economic development of the Pearl River Delta.