India's first underwater metro tunnel in Kolkata to become operational in 2023 | OneIndia News
  • 2 years ago
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.

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