High Quality Content by WIKIPEDIA articles! Nicoll Highway MRT Station (CC5) is an underground Mass Rapid Transit station on the Circle MRT Line in Singapore. It was under construction when the Nicoll Highway collapse occurred on April 20, 2004 causing four deaths and injuring three. The collapse set back the completion of the Circle MRT Line Stage 1 from 2008 to 2010, April 17. On April 20, 2004, a section of tunnel being built for the Circle Line collapsed, apparently when a retaining wall used in the tunnel's construction gave way. This occurred near what was to become the Nicoll Highway station on the Circle line, not far from the Merdeka Bridge. The accident left a collapse zone 150 m wide, 100 m long, and 30 m deep. Three workers were killed, with three more injured and one body which was never recovered.