I guess it could be used for two things, i had a underground safety room when I lived in OK ... but it was for a tornado bunker and man did we have allot of them, I remember going to the A & W up the road from my house and the parking lot was full of storm chasers, kind of neat seeing the equipment they set up and the huge tank cars but very scary when it's a mile away from your home. My property was worth more with the shelter.