Circle Line tunnel strengthening works to address tunnel squatting

Circle Line tunnels will undergo partial closures for strengthening works due to "tunnel squatting," causing longer wait times for commuters. The phenomenon, where tunnels deform due to compression of soft soil like marine clay, affects sections near Mountbatten, Dakota, and Paya Lebar stations. This issue, also seen in other cities, requires extensive work to install steel plates, with experts deeming it unlikely to be a widespread recurring problem.