In the early hours of August 26, 1922, the French battleship France, one of the last of the Courbet-class dreadnoughts, sank in Quiberon Bay after striking an unmarked rock. The ship, launched in 1912 and measuring 165 meters long, was returning from a military exercise off Belle-Île when it hit a submerged rock located 8 meters below the surface. At the time, this rock was not marked on any nautical charts, making the accident unexpected. The impact caused the ship to capsize and sink within less than a minute, resulting in only three deaths among the crew. Following the incident, the ship’s commander faced a trial at the Maritime Tribunal of Lorient. The tribunal ultimately acquitted him, citing the absence of any official indication of the rock in nautical instructions at the time. The rock was later named Basse Nouvelle in recognition of the event. The wreck of the France now rests at a depth of 15 meters in Quiberon Bay, where partial dismantling efforts continued until 1958. Today, some of the ship's remains are displayed at the Quiberon Museum, offering a glimpse into its history. Efforts to refloat the France were made shortly after the sinking, but they were unsuccessful. The wreck has never been fully raised, and the ship has largely faded from public memory. Several factors may have contributed to this obscurity: the low number of casualties, the commander's acquittal, and the historical context of the interwar period, which often emphasized military strength and avoided acknowledging failures. The France serves as a reminder of the unpredictable dangers of the sea, even for the most advanced naval vessels of the time. Despite its historical significance, the France is not as well known as other wartime shipwrecks. Its story is one of both technological ambition and the limitations of human knowledge in the natural world. The rock Basse Nouvelle stands as a silent testament to the vulnerability of even the most powerful naval constructions to the unknowns of the ocean.