Investigators found a shelter dug out with board on top. The wooden board would have prevented infrared cameras from the Utah Department of Public Safety's helicopter from spotting them.
A knife, a rope and other evidence was also found at the campsite, according to KSL.
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I've also read, and don't have the source right at my fingertips, that Mitchell and Barzee planned this for months, digging this hole/cave in the mountain in "preparation" for Elizabeth. Pretty sick stuff. I'll try and find the source for you tomorrow, if you would like.