India is working on building its first underwater tunnel below the Brahmaputra River in Assam. The tunnel is 15.6 km long and is designed as a twin-tube tunnel, while the project is estimated to cost Rs 14,900 crore. The Public Investment Board (PIB) has given its clearance to the project, which is yet to get a nod from the Union Cabinet. The massive structure is being built 32 metres beneath Brahmaputra’s deepest bed level. After the construction is completed, it will become one of India’s most ambitious and complex civil engineering projects in history.

The Defence Ministry will provide 20% of the funds for the project, while the remaining 80% will be funded from the Ministry of Road Transport and Highways, making the project relevant for both civilian and defence purposes.

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