The realistic Atlantis scenario is not sinking, but being engulfed as the water level rises. 20,000 years ago, sea level was hundreds of feet lower. If any industry was confined to coastal lowlands, it is all deep under the sea, now, and under tens or hundreds of feet of mud, besides.

Off India, there are mile after mile of large buildings under 60 feet of water. They were last above water ~7000 years ago.

There are many, many thousands of square miles of recent land between Indonesia islands, more between Australia and New Guinea, and between Britain and northern Europe. The Black Sea was mostly dry remarkably recently.