
The proposed project will have 10.8 km of twin tunnels and an additional km of approach roads on both ends, with three-lane tunnels connecting Magathane's Ekta Nagar in Borivali and Tikuji-NiWadi in Thane. The project involves constructing four giant tunnel boring machines (TBMs) at a maximum depth of 23 m below the surface. The tunnels will pass through the Sanjay Gandhi National Park (SGNP), which is the only national park in the world located within a metropolitan area. The travel time between Borivali and Thane is currently more than an hour, but the proposed 11.84 km-long tunnel project is expected to reduce the travel time to just around 15 minutes. The project is estimated to cost Rs 13,200 crore and is scheduled to be completed in five years.