The only way to find out what is in it or not in it is to drill a very long hole and place a small camera in the hole. It’s not clear if they would get permission to do that.
12 posted on 11/06/2017 7:33:49 AM PST by plain talk
15 posted on 11/06/2017 7:45:07 AM PST by wally_bert
(I didn't get where I am today by selling ice cream tasting of bookends, pumice stone & West Germany)