The 520-metre tunnel is part of the East West Metro Corridor of Kolkata
https://www.outlookindia.com/national/east-west-metro-corridor-india-s-first-underwater-tunnel-in-west-bengal-will-be-a-45-sec-ride-news-249396
The 520-metre tunnel is part of the East West Metro Corridor of Kolkata from the IT hub of Salt Lake Sector V in the east to Howrah Maidan in the west across the river.
Milestone.
https://www.outlookindia.com/national/east-west-metro-corridor-india-s-first-underwater-tunnel-in-west-bengal-will-be-a-45-sec-ride-news-249396
East West Metro Corridor: India's First Underwater Tunnel In West Bengal Will Be A 45-sec Ride
www.outlookindia.comThe 520-metre tunnel is part of the East West Metro Corridor of Kolkata from the IT hub of Salt Lake Sector V in the east to Howrah Maidan in the west across the river.