Chief Minister Uddhav Thackeray on Monday inaugurated the Tunnel Boring Machine (TBM), which the BMC claims is the largest in the country, for the ambitious Coastal Road project. The machine, named Malva, would bore two underwater tunnels between Priyadarshini Park and Chhota Chowpatty at Marine drive.

With the TBM launching on Monday, the civic body kick-started Package IV of the project, which mainly comprises the twin tunnels. The length of each tunnel is 2.07 km, and outer and inside diameters measure 12.19 meters and 11 meters, respectively.