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Nicoll Highway collapse[edit]

The relocated station and realigned tunnels
The relocated station and realigned tunnels

The Nicoll Highway collapse occurred in Singapore on 20 April 2004 when a Mass Rapid Transit tunnel construction site caved in, crumpling the Nicoll Highway near the Merdeka Bridge. Four workers were killed and three were injured, delaying the construction of the Circle Line (CCL). The collapse was caused by a poorly designed strut-waler support system, a lack of monitoring and proper management of data caused by human error, and organisational failures of the construction contractors and the Land Transport Authority. Following the incident, the collapsed site was refilled, and Nicoll Highway was reinstated and reopened to traffic on 4 December 2004. The authorities revised their construction safety measures so they were above industry standards. The CCL tunnels were realigned, with Nicoll Highway station rebuilt to the south of the original site underneath Republic Avenue. The station and tunnels opened on 17 April 2010, three years later than planned. (Full article...)