In his book, Nepal, Swiss geologist Toni Hagen writes about seeing the tunnel during his walk to Kathmandu in 1950, expressing surprise at such a sophisticated tunnel in the largely underdeveloped country.
Hetauda Municipality and the government of Province 3 have declared the tunnel a site of historic importance, and plan to preserve it as a monument. Col Dilli Jung Thapa had also established a temple at Churiyamai, which is now an important religious site in Hetauda.
Besides the tunnel, Col Thapa was also involved in the construction of the first cargo ropeway between Kathmandu and Hetauda, the Chandra Irrigation Canal in Saptari, the Dharara tower in Kathmandu reconstructed after the 1934 earthquake, the sanatorium in Tokha, and the Janakpur-Jayanagar Railway.
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