The 2,741-meter-long Gongbei Tunnel is 21 meters high with an excavation area of 336.8 square meters, bigger than any other highway tunnel in the world, China Railway Construction Corporation (CRCC) said.
The 55-kilometer Hong Kong-Zhuhai-Macao Bridge, situated in the Lingdingyang waters of the Pearl River Estuary, will be the world's longest sea bridge.