Larsen & Toubr & Hi-Tech Manufacturing & Services have announced that their 12.19 meter diameter Slurry Tunnel Boring Machine, named Mavala, had achieved a world record for monthly lengths by excavating 456.72 meters at the prestigious Mumbai Coastal Road Project, Package 4. Deployed from Girgaon Chowpatty, the TBM, presently the largest deployed in the country, broke the previous global record of 455.4 meters for monthly tunnelling done by a 13 meters single shieldEarth Pressure Balance TBM. TBM Mavala, named after infantry warriors in Shivaji’s army, was delivered during the height of the pandemic and since external experts could not travel, the team took it upon themselves to assemble the TBM with only some ‘virtual’ help. Weighing approximately 2,500 tonnes, the TBM was then lowered into the launching shaft in a fully assembled form. Another innovative method they adopted was to ‘rotate’ the TBM inside the shaft to start the second tunnel construction which saved them several months to dis-assemble, lift, transport, re-assemble & lower the TBM at a new location. Mumbai Coastal Road Project Phase-1 is a 9.98 km section from Princess Street Flyover at Marine Lines to the Worli end of the Bandra-Worli Sea Link involving sea front development and is a first-of-its-kind in India. The project is divided into 3 Packages viz.Package-I – From Amarsons Garden till Baroda PalacePackage-II – From Baroda Palace connecting it to Bandra Worli Sea LinkPackage-IV – From Princess Street Flyover at Marine Lines to Priyadarshini ParkL&T is executing Packages I & IV for MCGM involving the construction of a 3.82 km long section over reclaimed land from Priyadarshini Park to Baroda Palace and interchanges at Amarson Garden and Haji Ali. Package IV involves the construction of a 2 km long twin bored tunnel along with cut & cover, ramp, etc. to form a combined road length of 4.06 km. When completed, it would be the largest and deepest bored road tunnel in India.