Hindustan Times | Engineering marvel at 4500 feet: PM Modi to open Sikkim's Pakyong airport Hindustan Times State-of-the-art geotechnical engineering including soil reinforcement and slope stabilisation techniques were used because traditional retaining structures and embankments were ruled as unfeasible in the greenfield project, a government official said. Sikkim's Pakyong airport is an engineering marvel, a historic moment for India, says PM Modi - LIVE UPDATES |