Important Tunnel Projects and Major Tunnels in India

India possesses a vast network of strategic and complex tunnels across the Himalayan ranges, Western Ghats, and dense urban regions. These subterranean and high-altitude passages reduce travel distances, ensure all-weather connectivity to remote border regions, and support civilian and defense logistics. From high-altitude road passages above 10,000 feet to deep railway corridors, Indian tunneling infrastructure serves as a vital component of national transport connectivity.

Major Operational Road Tunnels in India

Dr. Syama Prasad Mookerjee Tunnel (Chenani-Nashri)

• Located on National Highway 44 in Jammu and Kashmir, connecting Chenani in Udhampur to Nashri in Ramban.
• Spans 9.28 km, making it India’s longest operational road tunnel.
• Bypasses the Patnitop pass, reducing the road distance between Jammu and Srinagar by 30 km and cutting travel time by two hours.
• Equipped with a transverse ventilation system, emergency exit passages every 300 meters, and integrated electronic monitoring systems.

Atal Tunnel (Rohtang)

• Constructed beneath the Rohtang Pass in the Pir Panjal range of the Himalayas in Himachal Pradesh.
• Spans 9.02 km at an altitude of approximately 3,000 meters (10,000 feet) above sea level.
• Connects Manali to the Lahaul-Spiti valley throughout the year, bypassing the snow-bound Rohtang Pass.
• Built by the Border Roads Organisation (BRO) using the New Austrian Tunnelling Method (NATM).

Sela Tunnel

• Located in the West Kameng and Tawang districts of Arunachal Pradesh along the Balipara-Charduar-Tawang road.
• Situated at an elevation above 13,000 feet, making it the longest bi-lane road tunnel at this altitude.
• Consists of Tunnel 1 (980 meters) and Tunnel 2 (1,555 meters), connected by a 1.2 km link road.
• Built by the Border Roads Organisation to enable all-weather military and civilian access to Tawang near the Line of Actual Control.

Banihal-Qazigund Road Tunnel

• Situated on National Highway 44, connecting Banihal in Jammu with Qazigund in the Kashmir valley.
• Spans 8.45 km, reducing the travel distance between Banihal and Qazigund by 16 km.
• Replaces the historic Jawahar Tunnel, providing a lower-elevation passage unaffected by winter snow and avalanches.

Major Operational and Under-Construction Railway Tunnels

T-49 Railway Tunnel (USBRL Project)

• Located on the Katra-Banihal section of the Udhampur-Srinagar-Baramulla Rail Link (USBRL) project in Jammu and Kashmir.
• Measures 12.77 km in length, serving as the longest railway tunnel in India.
• Includes a parallel escape tunnel connected by cross-passages every 375 meters to allow emergency evacuations.

Pir Panjal Railway Tunnel (T-80)

• Located on the Banihal-Qazigund section of the USBRL line in Jammu and Kashmir.
• Measures 11.215 km in length across the Pir Panjal mountain range.
• Built as a single-track broad-gauge railway line with a concrete-paved road bed alongside the tracks for emergency vehicle access.

Rapuru Railway Tunnel

• Located between Cherlopalli and Rapuru stations on the Obulavaripalli-Venkatachalam line in Andhra Pradesh.
• Spans 6.6 km, operating as India’s longest electrified broad-gauge railway tunnel.
• Constructed in a horse-shoe shape to facilitate heavy freight transport from Krishnapatnam Port to internal industrial hubs.

Karbude Railway Tunnel

• Situated on the Konkan Railway network near Ratnagiri in Maharashtra.
• Measures 6.5 km in length, functioning as the longest tunnel on the Konkan Railway line.

Strategic Under-Construction Tunnel Projects

Zoji-La Tunnel

• Located between Baltal in Ganderbal district of Jammu and Kashmir and Minimarg in Drass sector of Ladakh on NH-1.
• Designed with a total length of 13.15 km at an elevation of 11,578 feet beneath the Zoji La pass.
• Constructed as a single-tube bi-directional passage to provide year-round road access between Kashmir and Ladakh.

Z-Morh Tunnel

• Located near Gagangir in Ganderbal district of Jammu and Kashmir.
• Spans 6.5 km to provide all-weather access to the tourist destination of Sonamarg, acting as a precursor to the Zoji-La corridor.

Kuthiran Tunnel

• Located in Kerala along the Thrissur-Palakkad stretch of National Highway 544.
• Features a twin-tube six-lane configuration spanning 1.23 km through the Peechi-Vazhani Wildlife Sanctuary area.
• Serves as Kerala’s first twin-tube road tunnel, improving freight movement through the Western Ghats.

Comparative Summary of Major Indian Tunnels

Key Facts and Data Highlights

• The Border Roads Organisation built both the Atal Tunnel in Himachal Pradesh and the Sela Tunnel in Arunachal Pradesh.
• The New Austrian Tunnelling Method (NATM) is widely used in Himalayan tunnel projects due to fragile rock conditions and active seismic zones.
• Dr. Syama Prasad Mookerjee Tunnel was the first road tunnel in India to feature an integrated tunnel control system for ventilation and traffic monitoring.
• The Jawahar Tunnel, constructed in 1956 under the Banihal pass, served as the primary road link between Jammu and Kashmir before newer low-altitude tunnels opened.
• Rapuru Railway Tunnel in Andhra Pradesh allows electric freight trains to move directly between Krishnapatnam Port and the internal hinterland.
• Sela Tunnel bypasses the snow-covered Sela Pass at 13,700 feet, cutting travel time to Tawang by over one hour.
• The Udhampur-Srinagar-Baramulla Rail Link (USBRL) contains more than 35 railway tunnels along its mountainous alignment.