CASE STUDY Speeding Hong Kong Transportation by Going Beneath the Ocean To improve road transportation in Hong Kong, the local government decided to build the Tuen Mun-Chek Lap Kok Link (TMCLKL). This roadway connects the Northwest New Territories, Hong Kong Boundary Crossing Facilities (BCF), Hong Kong – Zhuhai – Macao Bridge, Hong Kong International Airport, and North Lantau. The TMCLKL’s design had to work around the existing roads, coastline, and 55-kilometer Hong Kong – Zhuhai – Macao Bridge, which includes cable-stayed bridges, four human-made islands, and a subsea tunnel. As a result, the TMCLKL had to incorporate a dual two-lane subsea tunnel, with a record-breaking depth of 55 meters below the surface, a length of 4.1 kilometers, and a total development cost of USD

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