The Longest Road: How India Conquered the Zojila Pass

Engineers and local workers have achieved a historic breakthrough on the 13.15-km Zojila Tunnel, finally securing year-round connectivity between Kashmir and Ladakh.

For generations, the Zojila Pass on the Srinagar-Kargil-Leh highway was less of a road and more of a seasonal lottery. As winter set in, the mountains would reclaim the route; blizzards and brutal avalanches frequently severed Ladakh from the rest of the country, leaving entire communities isolated for months. That era officially ended this June 9, as workers completed the final breakthrough of the Zojila Tunnel. The project is now set to be the world’s longest single-tube, bi-directional road tunnel at high altitude.

Engineering in the Clouds

Building a 13.153-kilometre passage at 11,578 feet is a feat of sheer endurance. The geology of the Himalayas proved notoriously temperamental, with the rock strata changing character 67 times along the route. To manage this, engineers relied on the New Austrian Tunnelling Method (NATM), constantly adjusting support strategies and using shotcrete to keep the mountain from collapsing on their crews.

The human cost of this project was as significant as the technical hurdles. Roughly 1,200 workers—80 per cent of whom hail from local communities—laboured in temperatures that frequently plunged to minus 30°C. They were limited to roughly 100 days of work per year due to the extreme climate, yet the project logged over one crore safe man-hours by April 2026. This progress was not without peril; at least five major avalanche events over five years challenged the site, including the harrowing 2023 incident at Sarbal where the Indian Army had to rescue 172 trapped labourers.

A Marvel of Ventilation

Because the project lacks a separate escape tunnel, precision was non-negotiable. The design incorporates three massive vertical shafts for emergency evacuation and airflow, with the western shaft plunging 474.3 metres into the earth—the deepest vertical shaft ever drilled in India. These aren't just technical statistics; they are the literal lungs of the tunnel, ensuring it remains breathable and functional throughout the year.

Why It Matters

This breakthrough is about more than just asphalt and concrete. By effectively bypassing the Zojila Pass, the project guarantees that Ladakh will no longer be held hostage by the weather. Strategically, this is a massive shift for both civilian logistics and national security, ensuring that essential supplies, medical aid, and regional trade can flow regardless of the season. It signals a move toward a more integrated Himalayan infrastructure, where the "curse" of the high-altitude pass is replaced by a permanent, reliable corridor. For India, the Zojila tunnel represents a significant leap in its capacity to tame some of the most unforgiving terrain on the planet.