Kolkata Underwater Metro | KMRC completes India’s first underwater metro tunnel
Kolkata: The tunnelling work under the Hooghly river, the first such underwater project in the country, to provide metro connectivity between Howrah and Kolkata...
Kolkata Underwater Metro | Know how Kolkata is Building Tunnel Under Water
Kolkata: Two top-order tunnel boring machines, nicknamed Rachna and Prerna, are digging India's first ever under-the-river Metro tunnels in Kolkata at full speed. If...




