The crossing under Brahmaputra will consists of three parallel tunnels: One for road, one for trains and one for emergency. Each of them will be 9.8 km long.
https://timesofindia.indiatimes.com/india/india-plans-own-channel-tunnel/articleshow/91606584.cms
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https://timesofindia.indiatimes.com/india/india-plans-own-channel-tunnel/articleshow/91606584.cms
India plans own ‘Channel’ tunnel | India News - Times of India
timesofindia.indiatimes.comIndia News: NEW DELHI: Road and railway ministries, and the Border Road Organisation (BRO) have come on board for construction of the country’s first underwater r.