Hancock makes the case that “Atlantis” may have been on the land mass called Sundaland before it was flooded by the melting ice (leaving present day Indonesia). Recent discoveries lead to a civilization going back 10,000 years or more.
The ocean’s all over the world, IOW, when the sealevel rose, lots of places got flooded. Plato knew about the Atlantic. He apparently didn’t know anything about Indonesia.