The construction of Indiaâs first underwater tunnel in Kolkata under the Hooghly river for establishing metro connectivity between Howrah and Kolkata is underway and will be made fully functional by 2023.from Moneycontrol Technology News https://www.moneycontrol.com/news/technology/indiaâs-first-underwater-metro-tunnelkolkata-will-be-functional-by-2023_16253341.html

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