I think it'd be rather hard for a hunter gatherer society to realistically cover such a large area under tons of rubble People didn't think hunter gatherer soc

I think it'd be rather hard for a hunter gatherer society to realistically cover such a large area under tons of rubble People didn't think hunter gatherer societies were able to build such structures and complexes in general. It seems a lot less likely that the Mediterranean flooded an area that far from the Black Sea that also happens to be 700m above sea level.