East–West Metro Tunnel
The 490th longest tunnel in the world
East–West Metro Tunnel is an underwater river tunnel of Kolkata Metro in Kolkata, West Bengal. The river tunnel is constructed underneath Hooghly River. It is the biggest underwater river tunnel of India, which is made for metro rail service. The East–West Metro Tunnel length is 10.8 km (6.7 mi) and width is 5.5 metres (18 ft 1 in). A 520 m (1, 706 ft 0 in) stretch of the tracks goes through a tunnel under the Hooghly River. The roof of the tunnel is about 30 metres (98 ft 5 in) from the ground level. The tunnel was completed in 2021. The tunnel is used by Green Line, also known as East–West Metro Line, for metro rail service by Kolkata Metro Rail Corporation and it was constructed by Afcons Infrastructure.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).