One thing the article doesn't touch on is the 'why'. What's the motivation behind this? There's a, I want to say similar but its sort of not, community/town in

One thing the article doesn't touch on is the 'why'. What's the motivation behind this? There's a, I want to say similar but its sort of not, community/town in my state called Coober Pedy where a good number of the dwellings are located almost entirely underground. Even on a 45c day, it's quite nice inside without any AC although when the lights are out the pitch black is pretty unsettling...