We have a hole in our yard… We have lived with it all these thirty years. It starts out five feet across and runs straight down deep. At seven hundred feet we have not found the bottom. We have determined that it passes through the volcanic rock ceiling of a massive cavern at 250 feet. We keep it covered and fenced off. I try not to think of that hole, seventy five feet from our house, but I admit that it does give me pause. To friends and family it is a fearful thing. To me it is just a reminder that nature holds some cards.