thats an idea i have not heard of, and it sounds bloody interesting. as i acknowledge you know more than most on the subject do you have one of your fantastic village maps showing why the tunnels were used? i would love to know more.
Can't really show a map of anything because I don't know the details of their locations. A typical fogou was sometimes located in a small iron age ditch and boundary settlement. A typical settlement would consist of 3-4 round houses built of timber mud and straw, a couple of enclosures for animals such as cattle, goats and chickens. Size is typically about perhaps 50 metres in diametre with a wooden fence and boundary ditch. The settlement would be surrounded by small plots with crops planted. Sometimes Fogou's were constructed within the settlement and their purpose is much debated by archaologists. Ideas ranging from cold stores, security and religious purposes have often been discussed. Imagine a terrible storm was heading your way with 100MPH winds and you lived in a mud hut! Seems a good place to seek refuge and also protect the crops that you have. So the general consensus is that they were sort of a iron age storm shelter\refuge. This does not mean however that the pictured tunnels in this thread are indeed Fogou's. It would take an investigation by an archeologist to determine this along with some dating material to back it up such as pottery etc.