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BuildSG: Home

Tunnel Routes Safely

Find out how an underground 'factory' is making Singapore's Circle Line MRT tunnel expansion safer and more efficient .

Last updated 24 June 2026
A person in a yellow safety vest and white helmet holds a flashlight and tablet inside a tunnel with illuminated walls and tracks.

Photo credit: SPH Media

Building Singapore is a 5-part series, in partnership with SPH, that aims to showcase contributions of the built environment sector in building Singapore and improving the living environment for Singaporeans.

Read on here to learn how engineering innovations, including a 100m-long "factory" deployed into the ground, are used to expand Singapore's rail network in a safer, more efficient way.