Sea level rise finished ~8000 ya. The sunken urban areas explored lately are mostly subsidence, e.g. Heraklion off Egypt. That said, there is a great deal of

Sea level rise finished ~8000 ya. The sunken urban areas explored lately are mostly subsidence, e.g. Heraklion off Egypt. That said, there is a great deal of underwater urban stuff off India not accounted for by subsidence. And a million square miles off southeast Asia still unexplored, that might or might not be urban. That would be any from before 8kya.