They didn't say that. My Dad thinks thats where it should be. Thats also worst case senario also. The lake 60 miles away from the sinkhole is now bubbleing with Methane. There is gas coming up all over the place. Gas travels and takes the path of least resistance. Thats a big field under there. So 500 miles is what that field encompasses. Get out a map. A map of the field and have a look at it. Then you decide whats safe.

Another thing to consider is all the pipelines in the area for hundreds of miles. Cascade effects. The potential for trouble on many different levels is there.

Then there's The New Madrid Fault.