Interesting, Sue. I've always thought that his Super Adobe shelters had a lot of merit, although they're about as aesthetically pleasing as a small bee hive!

I know it's going to vary by climate and location, but how deep do you think you'd have to dig to make an effective root cellar using this method? I guess I'm wondering if maybe it doesn't have to be as deep as what I think a traditional root cellar has to be. Or maybe my idea of a root cellar being something that you physically take stairs down into, like a basement, is also not an accurate idea either?