Key Highlights
- The 28‑kilometre Chungthang‑Lachen corridor has been completely reopened, restoring vital linkages for isolated hill communities.
- Restoration followed catastrophic cloudbursts in mid‑2025, Cyclone Remal in 2024 and a glacial‑lake outburst flood in 2023.
- Project Swastik enabled BRO engineers to clear 96 landslides, carve 8 km of new mountain alignment and construct several diversion routes.
- A new 400‑ft Bailey‑type suspension bridge over Taram Chu replaces flood‑damaged structures and guarantees all‑weather passage.
- The works bolster civilian mobility, tourism, and defence logistics along India’s eastern frontier.
Detailed Insights
The Border Roads Organisation (BRO) mobilised a multi‑disciplinary team to rehabilitate the Chungthang‑Lachen Axis after a series of natural calamities devastated the region. Under the umbrella of Project Swastik, crews excavated unstable slopes, installed rock‑fall barriers and executed eight kilometres of fresh formation cuts to secure the alignment. Parallel diversionary passages were forged to skirt zones prone to subsidence, ensuring continuous vehicular flow.
Simultaneously, the 400‑ft Bailey suspension bridge—known for its rapid assembly and modular components—was erected across the Taram Chu stream. Its design accommodates seismic activity and extreme weather, thereby delivering reliable connectivity for locals, tourists and security formations throughout the year.
Beyond immediate relief, these infrastructure upgrades are integral to the “Atmanirbhar Sikkim – Viksit Bharat” agenda, fostering economic resurgence, expanding trade corridors, and reinforcing border‑area defence capabilities.
Key Concepts
- Bailey Bridge: A prefabricated, portable truss bridge system originally devised during World War II, widely employed by the Indian Army and BRO for swift deployment in rugged terrain.
- Project Swastik: BRO’s strategic programme aimed at reconstructing and augmenting road and bridge networks in Sikkim and adjoining regions after natural disasters.
- Glacial Lake Outburst Flood (GLOF): Sudden release of water from a moraine‑dammed glacial lake, often triggering downstream flooding and landslides in high‑altitude catchments.