A devastating mudslide on the Kochi-Dhanushkodi National Highway (NH 85) near Adimali, Idukki, which claimed one life and destroyed eight homes, has drawn sharp criticism from experts who blame the National Highways Authority of India (NHAI) contractors for unscientific construction practices. The incident, linked to aggressive slope-cutting during the rainy season, has prompted the Kerala government to suspend all work on the highway until further notice. Geologists and residents point to flawed excavation methods as the primary cause of the disaster.

Dr. Sajin Kumar K S, assistant professor at Kerala University’s geology department, highlighted that contractors’ practice of sheer vertical cutting, sometimes up to 20 meters, without creating stabilizing benches, violates standard safety protocols. “Slope cutting with benches is essential to prevent instability, but contractors opt for vertical cuts and superficial fixes like shotcrete,” he explained. The region’s young soil, aged 10,000 to 15,000 years, lacks cohesion with the ancient rock base, making it highly susceptible to collapse when vertically cut.

The situation is worsened by rainwater seeping into exposed cuts, increasing pressure and destabilizing slopes. Experts warn that quick-fix solutions like retaining walls often fail under the weight of waterlogged or poorly compacted soil. The exposed hard rock beneath the collapsed soil in the Adimali mudslide serves as evidence of these structural failures, underscoring the dangers of neglecting proper excavation techniques.

Also Read: Kerala Landslide Near NH-85 Claims One Life, Leaves Trail of Destruction in Adimali

Residents of Laksham Veedu Colony in Koompanpara, near the site, had repeatedly warned officials about cracks appearing in the 40-foot ridge behind their settlement, destabilized by NH expansion work. “We alerted authorities multiple times, but nothing was done,” said Shaiju, a local resident. A revenue department official confirmed prior signs of soil movement, and Water Resources Minister Roshy Augustine, who visited the site on October 26, 2025, acknowledged the connection to NH work, promising a thorough inquiry and strict action.

The tragedy has intensified scrutiny on NHAI’s oversight and contractor practices, with calls for stricter adherence to safety protocols. As investigations begin, the suspension of NH 85 work signals the government’s intent to address these lapses. The incident highlights the urgent need for responsible construction practices to prevent further loss of life and property in Kerala’s vulnerable hilly regions.

Also Read: Kerala Landslide Near NH-85 Claims One Life, Leaves Trail of Destruction in Adimali