TheMumbai Coastal Road Project (MCRP)is a Rs 12,721-crore initiative by the Brihanmumbai Municipal Corporation (BMC) to link Marine Drive to theBandra-Worli Sea Link. The most significant feature of the project is the construction ofIndias first undersea tunnel, which is set to open by November 2023. The 2.07-kilometer twin tunnels run 17-20 meters below sea level, connecting Girgaon to Priyadarshini Park via the Arabian Sea, Girgaon Chowpatty, and Malabar Hill.

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The construction of the twin tunnels involved cutting through complex geological strata using a massive Chinese Tunnel Boring Machine (TBM) and a team of 35 men. The TBM, named Mavala, is the largest ever used in India, weighing over 1,700 tonnes and standing about 12 meters tall. It was manufactured by the China RAILWAY Construction Heavy Company Ltd (CRCHI) and was assembled and launched a year ago.