The twin tunnels are expected to be around 4.3-km long, and around 30 m wide.
https://indianexpress.com/article/cities/delhi/construction-of-twin-tunnels-beneath-southern-ridge-sc-committee-recommends-approval-8657748/
The project will involve felling of around 685 trees on non-forest land, and trees in the ridge area are not expected to be affected, according to the National Highways Authority of India’s (NHAI) proposal for the tunnels.
https://indianexpress.com/article/cities/delhi/construction-of-twin-tunnels-beneath-southern-ridge-sc-committee-recommends-approval-8657748/
Construction of twin tunnels beneath southern ridge: SC committee recommends approval
indianexpress.comThe project will involve felling of around 685 trees on non-forest land, and trees in the ridge area are not expected to be affected, according to the National Highways Authority of India’s (NHAI) proposal for the tunnels.