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Under the Ground of Marseille Sleeps the Largest Underground Canal in the World, 7.3 Km Dug and Forgotten Since a Landslide of 1963

Summary by SciencePost
Under the Estaque chain sleeps the Rove tunnel, the largest underground canal in the world with its 7.3 kilometres long. Inaugurated in 1927, this technical colossus collapses in 1963 and has remained walled since then. Sixty years later, this forgotten monument is about to be reborn, not for barges, but to restore the ecology of a Mediterranean lagoon. More
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Under the Estaque chain sleeps the Rove tunnel, the largest underground canal in the world with its 7.3 kilometres long. Inaugurated in 1927, this technical colossus collapses in 1963 and has remained walled since then. Sixty years later, this forgotten monument is about to be reborn, not for barges, but to restore the ecology of a Mediterranean lagoon. More

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SciencePost broke the news on Tuesday, June 23, 2026.
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