Larsen & Toubro was declared the low bidder for the 5.05 km UG1 underground civil works contract between Mominpur and Esplanade on the Kolkata Metro Purple Line. This northern and final part of the 15.215 km Line-3 (Joka to Esplanade / BBD Bagh) will be made up of twin tunnels that will connect four subterranean stations: Kidderpore, Victoria, Park Street, and Esplanade. L&T will be needed to install two new tunnel boring machines (TBMs) with one TBM on standby if and when awarded.

RVNL had requested bids for this contract in July 2022, with an estimated value of Rs 2571.28 crore. In February, technical bids were opened, revealing three bidders. L&T's offer of Rs 2447 was 4.82% lower than RVNL's estimate.