![]() ![]() In some cases, laborious manual digging had to be done to prevent disruption to commuters and ongoing train operations. The CCL also weaves through built-up areas, such as Dhoby Ghaut, the dense residential neighbourhoods of Bishan and Serangoon, as well as existing underground train lines and stations. The CCL tunnels run close to the Kallang-Paya Lebar Expressway tunnel, the Deep Tunnel Sewerage System, and cable tunnels near the Upper Paya Lebar/Airport Road junction, so extreme precision had to be exercised in building the CCL’s tunnels.
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