I was wondering if you could tell us a resource online where to find the locations of caves/mine shafts, or other underground shelters around the country. I have tried to do this unsuccessfully, maybe a reader knows? Thanks. – Robert R.
JWR Replies: That goes a bit outside my expertise. I’m not a spelunker. Perhaps some SurvivalBlog readers have bookmarked some good web sites or could recommend a few books.