The 9-kilometre Himalayan tunnel that conquered the world's most treacherous mountain passes
In short: Carved through the heart of the Pir Panjal range, the Atal Tunnel is a feat of engineering that provides an all-weather lifeline to remote valleys. By bypassing the snow-choked Rohtang Pass, this massive single-tube structure slashes travel time and ensures connectivity for regions previously isolated by brutal Himalayan winters.
The concept of a tunnel beneath the Rohtang Pass dates back to 1860, when the Moravian Mission first proposed it. It was not until 1942 that Dr. John Bicknell Auden of the Geological Survey of India formally conceived the project. Decades later, in June 2000, Prime Minister Atal Bihari Vajpayee officially announced the construction, driven by the advocacy of local residents. The Border Roads Organisation was tasked with the project in 2002, but progress was slow, hampered by extreme geological and environmental obstacles.
Construction was a battle against nature. Workers faced heavy water ingress, with one zone flooding at a rate of 3,000,000 litres per day in June 2012. The team had to manage over 800,000 cubic metres of excavated rock and soil while navigating unstable geology consisting of quartzites and schists. Because the terrain was unpredictable, engineers abandoned tunnel boring machines in favour of the drill-and-blast method. Winter was particularly unforgiving; the north portal became inaccessible, forcing crews to excavate three-fourths of the tunnel from the south end alone.
The finished tunnel, inaugurated in October 2020, spans 9.02 kilometres and sits at an altitude of over 3,000 metres. It features a horseshoe cross-section with an integrated emergency tunnel beneath the main road. Today, it serves as a critical link on National Highway 3, reducing the journey between Manali and Keylong from several hours of hazardous driving to just two. While it provides vital access to Lahaul and Spiti, the vision of an all-weather route to Ladakh remains an ongoing challenge, requiring further tunnel projects at high-altitude passes like Shinkula.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: Atal Tunnel
To cite this card, link to https://intellectplus.co.uk/app/places-atal-tunnel.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Countries and other regions · More in Countries & Cities · Latest · A–Z · All topics
