India's First Underwater Metro Tunnel in Kolkata
The construction of India's first underwater tunnel under the Hooghly river in Kolkata for the metro connection between Howrah and Kolkata is underway. The project is expected to be completed by 2023. The 520-meter of the 16.6-kilometer-long will be under the river bed. The tunnel corridor will connect Kolkata and Howrah and is 33 meters below the river bank. The Kolkata