India’s first underwater rail tunnel was completed
- The work of India’s first underwater rail tunnel in West Bengal under the Hooghly River (West Bengal) for establishing metro link between Howrah and Kolkatawas completed ahead of its schedule during May 2017 that was was July 2017.
- This portion of East-West Metro is being implemented by Afcons Transtonnelstroy and Kolkata Metro Railway Corporation Ltd and the entire project is 16.6 km long, out of which 10.8 km runs under the ground. Of this 10.8 km, 502 metres is under the water and connects Howrah to the west and Salt Lake to the east.
- The tunnel runs through 502 metres under the Hooghly River and for this a giant tunnel-boring machine (TBM) named ‘Rachna’ was employed.