1. India's First Underwater Metro Tunnel connect which of the following cities?
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By: guest on 01 Jun 2017 11.10 pm
A gigantic Tunnel Boring Machine is being used to build a underwater tunnel in the river Hooghly which connect Howrah with Kolkata. The tunnels are being dug at a depth of 30 metres below the earth's surface and 13 metres below the riverbed. The 520-metre tunnels under the river are part of the 10.8 km underground stretch.