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I have a friend who shares your "going to ground" fear. This guy has no concept of ultralight hiking, so he carries a military Goretex bivy sack on every trip. He puts it in the hammock and sleeps...

I just don't think that's possible. First of all, you can't stick a thermometer in frozen ground. And because it's frozen, you already know that it's below 32 degrees. One human is not going to thaw...

I'm waiting for the explanation on this as well. It seems like permafrost would not exist if this were true.