The Mumbai Metropolitan Region Development Authority (MMRDA) has completed around 250 metres of underground tunnelling for the Orange Gate-Marine Drive underground road tunnel project, marking a major milestone in the city’s next-generation mobility infrastructure initiative.

According to MMRDA, the tunnelling work was carried out using advanced slurry shield tunnel boring machine (TBM) technology along with the installation of permanent segmental tunnel lining rings, a key structural component that converts excavation into permanent infrastructure.