I was in the mountains. ;-)
But it doesn't take a big hole - just enough to fit what you want. Deeper is good, but mine was only 18-24 inches, I would have thought. If you can prevent the unwanted guests coming in around the edges it's good enough. I wasn't off-grid long enough to correct mistakes and make it better (and in winter, it's cold enough outside to not need it for 6 months.)