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<iframe allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/K3Hw1tJeglU" title="YouTube video player" width="560"></iframe></p>
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Great news for Indian people as the country&#39;s first underwater metro is going to be fully functional in Kolkata by 2023. The total length of tunnel will be 10.8 KM and a width of 5.5 meters. Metro connectivity will be between Howrah and Kolkata. Watch to know more&nbsp;</p>
