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You can not get to Atlantis. It is underwater because of the eruption of Thera.
the earthquake caused a volcanic eruption
thera
This was caused by the Minoan eruption of Thera or the Santorini eruption between 1642 and 1540 BC
Currently Thera is a caldera with a shield in it. Prior to its cataclysmic eruption it was a stratovolcano, also known as a composite volcano.