How did tunnelling 7m beneath Tanjong Pagar Railway Station avoid damage?

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Tunnelling 7m beneath Tanjong Pagar Railway Station was carried out without damaging the historic structure
Crews tunnelled just 7m beneath the nearly century-old Tanjong Pagar Railway Station and did so without damaging the structure. The public account of the project states this outcome, but it does not spell out the specific tunnelling techniques, ground stabilisation steps, or monitoring systems used to protect the station.
The key requirement was protecting the station while tunnelling only 7m below
The final stage of the Circle Line project is described as one of the Land Transport Authority’s most challenging engineering undertakings. Within that work, crews had to tunnel at a depth of about 7m beneath the nearly century-old Tanjong Pagar Railway Station.
The project timeline depended on cleared land parcels including the station site
The construction of the final stage could only proceed after key land parcels were returned and cleared, including the former Tanjong Pagar Railway Station and port terminals. This sequencing framed the conditions under which tunnelling under the station was carried out.
The account confirms “no damage” but does not detail the engineering method
The information provided confirms the result—tunnelling was done without damaging the structure. It does not provide the specific engineering methods or precautions, such as the exact tunnelling approach or how the ground around the station was stabilised.
Work also had to be coordinated around other live infrastructure
In addition to tunnelling under the station, crews also had to navigate works under the live Keppel Viaduct while protecting its foundations. The same project description highlights that protecting existing structures was a central constraint during construction.

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How did tunnelling 7m beneath Tanjong Pagar Railway Station avoid damage?

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