![]() A substantial chunk of the main highway running over the tunnel was also knocked out. ![]() Steel beams were twisted, with two construction cranes being swallowed up. Four workers were killed, with three more injured. The accident left a collapse zone 150 m wide, 100 m long, and 30 m deep (492 ft × 33 ft × 98 ft). This occurred near the Nicoll Highway MRT station under construction along the Circle Line and near the Merdeka Bridge. ![]() It eventually was found that the most apparent cause of the collapse was that the retaining wall could not handle the stress of holding up the tunnel, forcing it to give way. Investigations and probes into the collapse commenced immediately.
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