India Just Built an Airport in a Swamp

TL;DR

India built Navi Mumbai International Airport on swampland, a hill, and a river because Mumbai desperately needed a second major airport and had no other space.

Key Points

• 1.Mumbai's only airport, Chhatrapati Shivaji Maharaj International, is at capacity with asymmetrical terminals and intersecting runways that prevent simultaneous takeoffs and landings — a second airport was the only viable fix.
• 2.Engineers demolished a 92-meter solid rock hill using controlled blasting, generating 62 million cubic meters of rock that was then used to fill and stabilize hundreds of acres of swampland by raising the ground 6 meters.
• 3.A river running through the middle of the site was rerouted and widened from 25 meters to 200 meters in some areas to divert floodwater away from surrounding villages whose wetland absorption had been eliminated by the rock fill.
• 4.Phase 1 opened Christmas Day 2025 with one runway and one terminal handling 20 million passengers annually; by the 2030s, five phases will deliver 90 million passengers and 3 million tons of cargo per year.
• 5.The Zaha Hadid–designed lotus flower terminal features 17 hidden load-bearing columns behind 12 petal-shaped outer columns supporting a 370-meter canopy roof — but the airport currently has no rail access, with car journeys taking up to 3 hours from some suburbs.