Casablanca – A proposed undersea tunnel linking Morocco and Portugal is gaining renewed attention as it moves from a conceptual idea to a more advanced phase of technical studies and engineering planning. The project, described in several European media reports as ambitious and strategically significant, could reshape transport and trade flows between Africa and Europe if brought to completion.

Initial estimates place the project’s cost at more than $870 million, covering feasibility studies, permits, preparatory infrastructure, and the development of core components. While still in the planning phase, the initiative reflects a broader vision of strengthening economic integration across the Atlantic front and enhancing connectivity between the two continents.

A new corridor across the Atlantic

The proposed infrastructure aims to establish a direct transport corridor between northern Morocco and southern Portugal. On the Moroccan side, the route would connect to high-capacity road networks north of Tangier, a key logistics hub due to its proximity to major ports and industrial zones. In Portugal, the tunnel would integrate with the Algarve’s regional road system and the A22 motorway, providing seamless access to the wider European transport network.

By linking these networks, the project seeks to facilitate the movement of goods and passengers while reducing travel times. It is also expected to strengthen ties between ports, free zones, and industrial centers on both sides, potentially creating a new axis for trade and logistics between Europe and North Africa.

Engineering concept and technical features

According to preliminary designs, the tunnel would consist of a dual-tube structure with separate lanes for each direction of traffic. A dedicated technical corridor would be included to handle emergencies and maintenance operations. This configuration aligns with international safety standards commonly used in large-scale subsea infrastructure projects.

Advanced ventilation systems are planned, combining longitudinal airflow with controlled extraction points to maintain air quality inside the tunnel. The project would also incorporate real-time monitoring technologies, early warning systems, and internal safety shelters designed to respond effectively to emergencies.

Among the technical solutions under consideration are the use of prefabricated immersed sections installed beneath the seabed, as well as excavation through tunnel boring machines (TBMs) capable of operating under high pressure and in complex geological conditions. Engineers involved in early-stage assessments have emphasized that, despite its scale and complexity, the project relies on established technologies that have been successfully deployed in similar international projects.

Phased implementation approach

To manage complexity and minimize disruption, the project is expected to follow a phased development model. The first stage would involve detailed environmental and geotechnical studies, along with preliminary design work. This would be followed by the construction of tunnel entrances and assembly zones, which are essential for coordinating large-scale works.

The third phase would focus on the execution of tunneling and subsea construction, representing the most technically demanding part of the project. Finally, the installation of operational systems, testing, and commissioning would prepare the tunnel for service.

This step-by-step approach is intended to ensure continuity in regional transport flows while allowing for adjustments based on technical findings and environmental considerations.

Environmental and financial challenges

Despite its potential benefits, the project faces several challenges. The marine environment along the proposed route is considered sensitive, requiring comprehensive environmental impact assessments. These studies will examine potential effects on marine ecosystems, water currents, and biodiversity, with the aim of minimizing disruption and ensuring long-term sustainability.

Financial uncertainty also remains a key factor. While the initial budget exceeds $870 million, the final cost will depend on multiple variables, including seabed composition, seismic risks, and the financing model adopted. Large-scale infrastructure projects of this nature often require complex funding arrangements involving public and private stakeholders.

Part of a broader regional strategy

The Morocco–Portugal tunnel proposal is not an isolated initiative. It aligns with a wider set of projects aimed at enhancing connectivity between Europe and Africa, most notably the long-discussed undersea tunnel between Morocco and Spain across the Strait of Gibraltar. That project, which would primarily serve rail transport, is also under study and could be completed between 2030 and 2040 if approved.

Together, these initiatives reflect a strategic shift toward strengthening cross-continental infrastructure. Morocco, in particular, is positioning itself as a key logistics gateway between Europe and Africa, leveraging its geographic location and expanding transport networks.

Economic and tourism implications

If implemented, the Morocco–Portugal tunnel could generate significant economic benefits. By improving logistics efficiency and reducing transport times, it may boost trade flows and support the development of supply chains linking the two continents. The project could also attract new investments in transport, industry, and services.

In addition, enhanced connectivity may stimulate tourism by making travel between Morocco and Portugal faster and more accessible, especially for coastal regions that are already popular destinations.

Outlook

While the project remains in the planning stage, its progression toward detailed studies signals growing interest in large-scale infrastructure solutions to bridge Europe and Africa. The coming years will be decisive, as technical assessments, environmental evaluations, and financing decisions determine whether the proposal moves forward.

If realized, the undersea tunnel could mark a significant milestone in regional integration, contributing to a more connected and dynamic economic space across the Atlantic and Mediterranean regions.