Homo sapiens has been around for almost 200,000 years.
You could speculate that urban life has been around a lot longer than 10,000 years. But what would they have left behind that was durable enough for us to find now, and if they did, where would we look?
All the good seaside sites are under water now.
Yup. I think Sundaland would be a good place to look for Atlantis too.