Abstract: There are two offshore artificial islands and a longest highway immersed tunnel in the Hong KongZhuhaiMacao bridge project. First, the major technological advancement of immersed tunnels and artificial islands is discussed. Second, prospects are made in the new construction techniques of sustainable and green immersed tunnels and artificial islands, which include: (1) the factory flowline prefabrication method for 80 mlong immersed tube with high efficiency, less land occupancy, and fewer processing steps based on the factory flowline prefabrication of 180 mlong segmented or semirigid immersed tubes; (2) the negative freeboard (buoyancy) immersed tunnel design methodology and floataid construction philosophy, as well as their advantages with regards to longdistance transport and multiple tube prefabrication; (3) the improvement directions of the positivewater stop deployable connectionreversible closure joint for the immersed tunnel; and (4) new construction methods for prefabricated artificial islands based on the comparison of construction concepts between conventional artificial island construction method and deepinsert steel cylinder and auxiliary cells constriction method.

Key words:

immersed tunnel, artificial island, sustainability, rapid construction