Transportation Videos

How the World’s Most Remote Megaproject Went Wrong

The video examines the New Coastal Road on Réunion, a French overseas department in the Indian Ocean, and how the island’s most ambitious megaproject has stalled. The original 1959 cliff‑side route, used by 80,000 vehicles daily, was prone to landslides and cyclones, culminating in a deadly rock fall in 2006 that spurred the design of a new offshore alignment featuring France’s longest bridge, the 5.4‑kilometre Grande Chaloupe viaduct.\n\nConstruction demanded unprecedented local solutions: two on‑island concrete factories produced massive box‑girder sections, and the Polish‑built barge Zourite ferried 48 custom piers and lifted them into place. Yet the project’s most critical component – a 17‑metre‑high dyke armored with millions of concrete accropodes – ran into a shortage of rock, as environmental groups blocked quarry permits and the required volume was later revised from 7 million to 12 million cubic metres.\n\nThe shortage forced engineers to enlist local farmers to clear basalt boulders from fields, a creative but insufficient workaround. Compounding the crisis, 800 accropodes were mis‑installed, necessitating a €20 million remediation, while overall costs ballooned beyond $2 billion, making the road one of the world’s costliest infrastructure ventures.\n\nThe saga underscores the perils of building megaprojects in remote, geologically volatile locations: environmental opposition, logistical constraints, and under‑estimated material needs can derail even technically brilliant designs, prompting policymakers to reassess risk, budgeting, and community engagement for future large‑scale infrastructure.