I have long thought of doing this , but made out of cement . I call it the “Troll cave ” . Before changing careers , I worked in the exhibit/ artificial habitats industry for over 25 years . The plan was to make a two man evasion shelter , disguised as the native rock formations in any given area . It would be provisioned , and equipped ahead of time , all one would have to do , is get there ( and knowledge of HOW to get inside ) . Other wise , it would appear to be part of the natural landscape , people could camp on it , or near it , and never suspect it was not what it appears to be .
