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India’s first underwater train soon operational under Kolkata's Hooghly River

India’s first underwater train soon operational under Kolkata's Hooghly River

The first underwater train in India will be operational under Kolkata's Hooghly River.

Construction of the metro tunnels under the river began at the Howrah end in April 2017. The tunnels are 520 metres long and about 30 metres deep. Two top-order tunnel boring machines, nicknamed Rachna and Prerna, were brought from Germany in parts and assembled underground for the construction of the tunnels.

Underwater Train project

The train will be part of the Kolkata Metro Line 2, also known as the East-West Metro. The 16km-line will be made operational in two phases. The first phase, connecting Salt Lake Sector 5 station to Salt Lake Stadium station, will span across 5 km and is scheduled to start running later this month. The new metro line is expected to cut travel time for commuters significantly.

The underwater sector on this line will connect Salt Lake Sector 5 station to Howrah Maidan station. Once completed, the under-the-river Metro ride will be all of 60 seconds long.

As of now, Kolkata has just one metro line, known as North-South Metro.

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