Argentina-Chile Agua Negra tunnel TBM to bore 14 km Andes link at 3,600m

Argentina and Chile are advancing the Agua Negra tunnel project, with a TBM set to excavate and line two parallel 14 km tunnels through the Andes at over 3,600 meters altitude. The project aims to provide a year-round transport link between San Juan province and Chile, reducing reliance on high-altitude passes. Construction details and timeline remain uncertain, but the scale and altitude present significant engineering challenges.