What major engineering feats were required for the final Circle Line stations?

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The final Circle Line stations required tunnelling just 7m under the old Tanjong Pagar Railway Station and careful works under the live Keppel Viaduct.

Crews carried out two major engineering feats for the final stage of the Circle Line, which includes the Keppel, Cantonment and Prince Edward Road stations. One challenge was tunnelling only 7m beneath the nearly century-old Tanjong Pagar Railway Station without damaging the structure. Another was carrying out construction works under the live Keppel Viaduct while protecting its foundations.
Tunnelling 7m beneath the nearly century-old Tanjong Pagar Railway Station
The works for the final stage required tunnelling just 7m below the nearly century-old Tanjong Pagar Railway Station. Crews had to do this without damaging the station structure, reflecting the tight clearance and the need to protect an existing heritage asset.
Construction works under the live Keppel Viaduct
Crews also had to navigate construction under the live Keppel Viaduct. The key requirement was to protect the viaduct foundations while works were carried out beneath it, as the structure remained in operation during the project.
Completing the final stage that enabled the loop to operate
The final engineering works supported the completion of the Circle Line loop, which opened on July 12. With the loop closed, the line is set to run clockwise, anti-clockwise and a shuttle to and from Dhoby Ghaut, using a fleet of 87 trains.

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What major engineering feats were required for the final Circle Line stations?

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