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We found one probably 2 or 3 years ago after the original post a while ago. I was just walking down the hill and saw the top of the opening covered and I dug it out. What it isn't is ice or a volcano cavern or anything else I have ever seen. It was a tube and it was lined with something that my leatherman bounced off of. I carry an old iphone that just has MotionX and a bunch of survival pdf's and when I went to take a pic of it, just in case, the phone was dead with an overheat warning, it had a little red thermometer. I have never had that happen. It's kinda neat but the threads devolve into "I know what it is even though I have never been there"
