Agua Negra Tunnel Construction Has Resumed
Work on the long-awaited project connecting Chile and Argentina has restarted on the Chilean side.
Updated on Oct. 8, 2026 in South America
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The Agua Negra tunnel project has officially resumed work on the Chilean side, marking a significant step for the 8.7-mile connection through the Andes. This infrastructure effort aims to link San Juan Province in Argentina with the Coquimbo Region in Chile.
Why it matters
The tunnel will replace a seasonal mountain pass that closes during winter, offering year-round access to the Pacific Ocean. This corridor is designed to boost tourism, cultural exchange, and export capacity to Asian markets for central and northwestern Argentine provinces.
The project spans 8.7 miles and reaches an altitude of 13,000 feet within the Andes Mountains. It connects the San Juan Province in Argentina to the Coquimbo Region in Chile.
The players
Inter-American Development Bank
This international financial institution provides funding for economic and social development projects across Latin America and the Caribbean.
Mauricio Macri
He served as the President of Argentina from 2015 to 2019, during which time his administration oversaw budget cuts that paused the tunnel project.
The details
The project represents a major engineering effort to bypass high-altitude terrain that remains impassable during winter months. International financing for the endeavor was secured through the Inter-American Development Bank.
Timeline
Construction previously halted during the administration of Mauricio Macri.
The project has historically operated using a seasonal summer-only mountain pass route.
Work resumed on the Chilean side of the tunnel project in October 2026.
Travel Outlook
This project aligns with the Inter-American Development Bank's regional integration initiatives to foster economic ties. It signals a move away from reliance on seasonal mountain passes toward permanent, year-round international logistics corridors.
Travelers should note that the current mountain pass remains restricted by seasonal weather conditions until the tunnel is completed. Future visitors can expect more reliable year-round transit options between Argentina and Chile once the project is operational.
The takeaway
The tunnel project highlights the shift toward year-round connectivity in the Andes to facilitate international trade and tourism. Travelers and businesses should monitor future updates regarding the timeline for the Argentine side of the construction.
Further reading
For more information on regional developments, visit the South America section.
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