Singapore Tunnel Team May Have Cut Corners 5/17/2004
...shops also have complained in recent months of cracks in their walls and blamed the construction of the Circle Line for the damage. More ominously, three other failures have occurred on the project, requiring backfilling, redesign and excavation. One occurred in the circular shaft and the other two on the cut-and-cover line. None caused loss of life.
After the April 20 collapse, Nicoll Highway settled more than 3 m, while on the other side of the cut the settlement was on the order of 10 m. A crane, construction steel and other materials also sank into the 100 x 130-m-wide crater.