(C) AS USA

CÁDIZ, SPAIN — In a landmark achievement for maritime archaeology, researchers have announced the discovery of the French submarine Le Tonnant, which vanished over eighty years ago during the height of World War II. The vessel was located off the coast of Cádiz, ending decades of speculation regarding its final resting place.

A Collaborative Scientific Triumph
The discovery was the result of a joint mission conducted in November 2025, involving the University of Bretagne Occidentale and the oceanographic team from the University of Cádiz. Utilizing advanced multi-frequency sonar technology, the team pinpointed a wreckage structure approximately nine miles off the coast of Rota.

The breakthrough followed a failed attempt in 2024, which was hindered by poor underwater visibility. Success was finally achieved by merging high-tech scanning with "human" history. Researchers re-examined personal diaries and navigation notes provided by the families of the original crew, allowing them to narrow the search grid significantly.

The Legacy of Operation Torch
The Le Tonnant was a key player in Operation Torch, the massive Allied invasion of North Africa in 1942. Historical records indicate that after sustaining heavy damage during the conflict, the crew made the strategic decision to scuttle the vessel—intentionally sinking it—to prevent the submarine from falling into enemy hands.

While the technical data and hull dimensions recorded by the sonar align perfectly with the blueprints of the French submarine, researchers remain cautious. Because the murky waters have prevented clear photography, a follow-up documentation campaign is being planned to provide definitive visual confirmation.

Legal Protection and Environmental Concerns
The discovery has ignited a debate over the management of wartime shipwrecks. Under the 2001 UNESCO Convention on the Protection of the Underwater Cultural Heritage, the site is protected from looting and unauthorized intervention. The Center for Underwater Archaeology of the Junta de Andalucía (CAS) is expected to lead the efforts in documenting and preserving the site.

Beyond its historical value, the wreck presents a potential ecological challenge. Marine scientists have raised concerns regarding "polluting shipwrecks." Like many vessels from the 1940s, Le Tonnant may still contain fuel and oils. As the hull corrodes over time, there is a risk of leakage that could impact the local marine ecosystem, necessitating a specialized environmental risk assessment.

A Maritime Corridor of History
The location of the wreck underscores the strategic importance of the Bay of Cádiz and the Strait of Gibraltar during World War II. For the families of the mariners and the local community—who had long shared rumors of the "ghost sub"—the find provides a long-awaited sense of closure.