The Proposed Underwater Tunnel Under the Strait of Magellan
Crossing from Chile to the island of Tierra del Fuego or vice versa currently involves depending on ferries and barges. Typically, around 600 vehicles and 2,000 people make this journey every day. Given the challenging weather conditions in the extreme southern region of Patagonia, which often leads to the suspension of marine transport services, the idea of constructing an underwater tunnel linking these regions is gaining traction.
Overview of the Tunnel Project
The planned underwater tunnel would span approximately 3.7 kilometers at First Angostura, effectively replacing the current ferry system. This concept has been discussed for many years but has recently gained political momentum. The tunnel aims to connect Punta Delgada in the continental area to Bahía Azul on the Big Island of Tierra del Fuego, making it feasible given the geographical features of the Strait of Magellan.
Why Now?
The project has been integrated into the Extreme Zones Development Plan 2025–2035 of the Magallanes Region since June 2025. Governor Jorge Flies is spearheading efforts to revitalize public interest and political backing for this initiative, which has fallen into relative obscurity in past years.
Technical Feasibility
According to Francisco Hernández, an academic from the University of the Andes, the construction of the tunnel is technically feasible. However, it requires thorough understanding and assessment of seabed geology, water pressures, sea currents, and seismic activity. Both TBM-type tunnel boring machines and conventional rock excavation techniques may be employed, depending on the results of detailed studies. Preliminary assessments by Norwegian engineers indicate that conditions may be favorable for such an undertaking.
Financial Considerations
Projected costs for the underwater tunnel range between $500 million and $1.5 billion. As this is a binational project, financial discussions must include both Chile and Argentina, focusing on investment distribution, management models, and long-term maintenance guarantees. Proper agreements are essential for the project’s viability, which hinge on clear arrangements between both countries concerning financial responsibility and operational frameworks.
Current Status
At this juncture, the underwater tunnel exists merely as a proposal within Chile’s planning documentation. There are no confirmed plans for construction, nor is there a definitive agreement between Chile and Argentina regarding the project’s funding. The next steps will involve conducting comprehensive geotechnical and geophysical studies. These studies are crucial to refining the design, estimating costs, and ensuring safety measures, evacuation plans, and emergency systems.
Conclusion
The underwater tunnel project under the Strait of Magellan holds great potential to enhance connectivity for Chile and Argentina while significantly improving transport logistics to Tierra del Fuego. As discussions continue, interested parties will be anxiously awaiting advancements in financing agreements and feasibility studies.
Cover image | Vincent Etter and Ricardo Gomez Angel