Zojila tunnel breakthrough: Why the project is crucial for India''s defence

📌 Summary:

• The Zojila tunnel — the world''s longest high-altitude bi-directional road tunnel — achieved a construction "breakthrough" (Tuesday), marking the end of its excavation phase
• It is a 13-km tunnel at 11,758 ft connecting Baltal (near Sonamarg, Kashmir Valley) and Minimarg (near Drass, Kargil, Ladakh), bypassing the treacherous Zojila pass (16,430 ft) that closes in winter and is landslide-prone
• Benefits: cuts the Sonamarg-Drass distance by 27 km and travel time by 2+ hours; gives year-round, all-weather connectivity to Ladakh, which is otherwise cut off ~6 months a year (Srinagar-Sonamarg-Leh and Leh-Manali highways shut by snow/avalanches)
• Strategic/defence value: provides swift round-the-year mobility for the armed forces and reduces dependence on air transport in the strategic Himalayan region
• Engineering: a "breakthrough" is when excavation teams from opposite ends meet; excavation used the New Austrian Tunnelling Method (NATM) — sequential excavation, immediate rock-bolting support and continuous geotechnical monitoring — suited to fragile Himalayan geology
• Project: Rs 6,800 crore; part of the 30.894-km Zojila project; foundation stone laid by PM Modi in May 2018; delayed by Covid, a 2024 terror attack on Z-Morh (Sonamarg) tunnel workers and extreme weather; now targeted for February 2028 (NHIDCL implementing; MEIL constructing)

🎯 UPSC Relevance: GS3 Internal Security & Infrastructure — strategic border connectivity, all-weather military logistics in the Himalayas; links to GS3 disaster (avalanche/landslide resilience).

📝 Prelims Facts:

• Zojila tunnel: 13 km, at 11,758 ft; connects Baltal (Kashmir) and Minimarg/Drass (Ladakh), bypassing Zojila pass (16,430 ft)
• Built using the New Austrian Tunnelling Method (NATM)
• Cost ~Rs 6,800 crore; implemented by NHIDCL, constructed by MEIL; target Feb 2028
• World''s longest high-altitude bi-directional road tunnel

🔑 Key Term: NATM (New Austrian Tunnelling Method) — a tunnelling approach using sequential excavation with immediate support (rock bolts, shotcrete) and continuous monitoring, suited to unstable rock.