The dwellings dugouts in Coober Pedy have very strict building regulations that take into account ventilation Vertical shafts , stability , surface water , emergency exits and lighting etc . Most also have skylights to allow natural light into the residence . The cost of building these dugouts is no more than building an above ground dwelling and being underground they keep more of a constant temperature . Edit Just to add on , Coober Pedy is ideal territory for this type of housing because of the terrain sandstone and the climate very dry . It is not something that would work in a lot of places . <| sep |> Not even one ? <| sep |> Well I mean you can cram a lot more 22 lr into a 1911 mag then 45 acp so it makes sense right ?