India’s First Underwater Metro Tunnel In Kolkata This underwater metro service will connect the twin cities of Kolkata and Howrah. The underwater metro tunnel is a part of the Howrah Maidan-Esplanade section of Kolkata Metro’s East-West corridor, which will cover a distance of 4.8 km under the Hooghly river. It is anticipated to cross a 520-meter section beneath the Hooghly in 45 seconds. Source: KMRC Connecting Places: Howrah and Kolkata, two twin cities, will be connected by the Underwater Metro service. The Howrah Maidan-Esplanade segment of the Kolkata Metro's East-West track, which will run 4.8 km beneath the Hooghly swash, includes the Aquatic Metro Tunnel. It is expected to pass under the Hooghly in 45 seconds over a 520-rate segment. Metro Train Crossing a River The lower part of the tunnel is 26 meters below the river's surface, and the trains run 16 meters below the riverbed. Of the six, three will be underground stations. Kolkata Metro's significance: the count...