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There are numerous submerged cities off the coasts of Spain and Portugal, and also in the Black sea.
They were covered as the glacial ice melted on the continents.
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Not really news. I’ve always thought Tarshish (near Cadiz, or ancient Gades) was possibly near the legendary “Atlantis”,
which, if it existed, was just a city on an island in the Guadalquiver river, which got submerged in a flood.