As follows is an enjoyable video which show and archaeological romp through a town with a synagogue in it, and other structes, even where houses might have been.
What is on topic ofr us is that there amny tunnels all over the place. There are escape tunnels, and tunnels which seem to just come to an end. At least this shows that the people of that time were familiarized with the idea of underground possibilities. And perhpas the tunnel endings are places that were cemented up to block off any idea of accessing underground worlds. In Tibet, tunnel entrances are blocked off and cemented up and covered over with dirt.
It could be.