The Gateway to the Lost City was an Isu vault located below the Greek island of Thera, serving as a gateway to the underwater city of Atlantis.
After he had discovered the vault, Pythagoras spent many years researching for ways to seal it off. By the time of the Peloponnesian War, he'd figured it out and charged his daughter, the Spartan misthios Kassandra in securing the relics required.[1]
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