Nagdhunga tunnel (Nepali: नागढुंगा सुरुङ्ग) is a under-construction highway tunnel connecting Sisnekhola of Dhading district and Nagdhunga in Kathmandu. [1] The tunnel will be a part of Tribhuvan Highway. The tunnel has a height of 8.3m and have a lane of 9.5m wide. The length of the tunnel is 2688 m.