Highway embankment gives way in Kollam, investigation begins

A newly built embankment along National Highway 66 at Mylakkadu in Kollam collapsed without warning, trapping several vehicles, including a school bus, and causing deep ground fissures across the service road. Although all occupants were safely evacuated, the failure created significant disruption along the Mevara–Kadampattukonam stretch and forced authorities to seal the area for emergency stabilisation. Early observations indicate that the collapse originated at the retaining wall supporting the under-construction flyover, which subsequently pulled the adjacent service road downward. The event has revived longstanding concerns regarding the geotechnical suitability of NH-66 alignments, particularly where construction has advanced rapidly on soft or reclaimed terrain.

Initial statements from NHAI officials suggest that the embankment may have been founded on paddy field soils with low shear strength and high compressibility. Similar failures were recorded in May 2025 at Malappuram, where elevated sections collapsed near reclaimed paddy land. Such ground conditions require rigorous pre-construction investigation, staged embankment loading, surcharging, and robust retaining structures. Following the collapse, structural assessments began immediately, alongside reinstatement of water supply systems and partial traffic restoration. An expert team from Delhi will conduct a detailed investigation, while heavy machinery is being deployed to remove unstable material and secure the site.

Political leaders and technical reviewers have highlighted possible deficiencies in design quality, construction supervision, and slope stabilisation practices. Congress representatives cited repeated beam failures and collapses along NH-66 and called for a comprehensive safety audit. The incident also echoes earlier expert reviews, which recommended stricter geotechnical assessments at 17 additional sites. Meanwhile, NHAI has initiated disciplinary actions in previous collapses, signalling an increasing focus on contractor accountability. The latest failure underscores the importance of reliable subsurface investigations, conservative design for soft-soil corridors, and transparent oversight mechanisms to prevent recurring infrastructure instability.