MMRDA: Engineering Mumbai’s Underground Future

31 Jan 2026 CW Team

Somewhere beneath Mumbai’s restless surface, a second city is being built into existence.
In the late afternoon, as the day leaned towards evening, Dr Sanjay Mukherjee, Metropolitan Commissioner (MMRDA), led us into a realm that very few ever enter—the active heart of one of Mumbai’s most ambitious underground road projects. While the city surges forward in familiar chaos above the ground, another Mumbai is taking shape below: quietly, methodically, irrevocably. The metal lift doors close. The cage begins to descend—smooth, steady, controlled, a faint hum underfoot. An anticipation amongst the Construction World team, that something extraordinary lies ahead.
The doors open. A colossal, 2,400 tonne, tunnel boring machine commands the space! With a cutterhead diameter of 12.19 metre and a total length of 82 metre, the slurry shield TBM is engineered to navigate Mumbai’s challenging coastal geology and high-water ingress zones with precision and safety..

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