In land scarce Singapore, the government tries to keep a sustainable number of private cars and other vehicles. Every now and then, there are plans to extend the expressways or create new ones to relieve congestion of the existing ones. A new addition is the Marina Coastal Expressway. Although it is only about 5km long, during the feasibility stage, its estimated cost was 2.5 billion SGD. The reason is that this expressway, constructed in Singapore's notorious marine clay, also is Singapore's first undersea tunnel and working conditions were sometimes as deep as 60m. The contractors also reclaimed 13.1 hectares of land. Building in the open seas implied factoring in tidal conditions and the fact that the 420m undersea tunnel is only about 150m from the Marina Barrage. Furthermore, the tunnel also runs above the North-South Line metro.
This is not the MCE, but Nicoll Highway, by the way.
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