North-South Corridor enters toughest phase as hard rock and tight tunnels slow work

Singapore's North-South Corridor has entered its most technically demanding construction phase, with hard rock, groundwater and tight spaces slowing progress. At Novena, tunnelling passes within about 1m of the North-South Line, requiring smaller excavation sections and extra ground support. The 20km project includes an 8.8km viaduct and 12.3km tunnel, with the viaduct expected to open from 2027.