Hong Kong-Zhuhai-Macao Bridge will be the world's longest cross-sea bridge, the engineers have to spend up to six years to complete this huge building, every day they have to avoid the 4000 sea going vessels and 1800 flights of dense traffic, with 50 tons of steel to build the world's longest steel bridge, consuming 2.3 million tons of reinforced concrete, deep underwater they have to build the world's longest submersed tube tunnel, to enable the world's largest giant shock hammer to complete the construction of an artificial island.