Agua Negra Tunnel: Decade-delayed Chile-Argentina Andes megaproject still stalled

The Agua Negra Tunnel, a 4,000-meter-high trans-Andean link between Argentina's San Juan province and Chile's Coquimbo region, remains unbuilt a decade after planning. The project aims to reshape regional trade logistics but faces continued delays, with no clear completion timeline. Its status underscores persistent infrastructure financing and political hurdles in South America.