I'm sorry but I have to disagree with you, the Atlantic is where it'd be if Plato was right, because he said it was beyond the Pillars of Hercules/Straits of Gibralter he didn't say beyond the Americas. Furthermore pre-indo European civilizations go back 30000+ years ago, If Atlantis existed and got stuck in european cultural memory prior to Plato as his fiction has then it is likely to be a local event.
Plato is a fake & a Plagerist his story of Atlantis was plagiarized from the myths & legends, of much older cultures of the south pacific.
Any advanced Civilisations would not be found in the Atlantic,
sh*t europe is just a baby compared to the land masses of australia & south america & Asia & Africa, where the legands came from.
Hiva ......... Left 7 Ancient Civilisations
Japan's Underwater Ruins
Australia is the oldest land formation on the earth.
Australia has the oldest rock formations which date from 3 billion to 4.3 billion years ago. ...That is way older than the continent of europe which formed out of eurasia just 325 to 375 million years ago.