
Patel Engineering Ltd. constructed the tunnel with a 3.2 diameter open type tunnel boring machine (TBM). The Tunnel passes beneath the city with an overburden cover of approximately 100m and being with a smaller diameter of 3.2 is harder to execute. PEL started digging the tunnel last year and has completed 3km of tunneling out of a total of 5.5km. in January 2022.
Patel Engineering Ltd. (PEL) achieved the fastest tunnel boring of 600 meters by TBM. This is a tunnel boring record using a Tunnel Boring Machine segment of 3.2m dia. tunnel in Mumbai below 100m ground level.