bottomless pit?

Today the newspaper had a new article about a mysterious bottomless pit the site of a crater somewhere in Washington. It was said to be a site of supernatural related. What is interesting is the bottomless part. It is hard to imagine to have a bottomless holes on Earth, no matter how deep you dug there will always be an end. However it is a interesting article that if you search on google for Mel's Hole, you will get results on this, and possible other related pits.