Once the Mediterranean was reconnected to the Atlantic Ocean, about 5.5 million years ago, its level has been locked to the ocean’s level. So more recent ice age level changes affected the Med as well. Some of the variation has to do with this but it generally predates 7000 years ago.
However, most of the “submerged cities” like this around the Med, like Alexandria’s ancient harbor, are the result of more local drops in the crust due to tectonic shifts and the resultant earthquakes.
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