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2017-05-24 / admin

India's first underwater tunnel finished ahead of schedule

India's first underwater tunnel, which was built under the Hooghly river for establishing a metro link in Kolkata, has been completed before the deadline. A giant tunnel-boring machine was deployed to dig the underwater tunnel that runs a length of 502 metres under the river. The job was completed in about a month, 50 days ahead of schedule.

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