India's first underwater metro tunnel, being built in Kolkata, will become operational by 2023. The transport tunnel is being by constructed inside the Hooghly river and reports suggest that 80% of the construction has been completed. The tunnel corridor is built 33 meters below the riverbed and will connect Kolkata to Howrah.
#IndiasFirstUnderwaterTunnel #FirstUnderwaterMetroTunnel #UnderwaterTunnelInKolkata
