only in the mediterranean region
though they might have heard a noise, people elsewhere would heve known nothing about it.
(Flood stories elsewhere are most often linked to local impact mega-tsunami. The tales are broadly datable, detailed as to the casaul agent, and in more and more cases verified by an associated layer of marine sediments and sub-sea impact crater.)
However, I wonder if this mega-tsunami might have breached the bospours straits? We'll see.