Speaking of basements

A few years back I saw a few episodes of "Doomday Preppers" on TV. And one of the "preppers" had a twisted idea of saving his family which was bugging-in a basement under s commercial building in the downtown part of a city !!! I was surprised to say the least, what was he thinking when he drew this plan. The only entrance to this basement was from the footpath itself. His wife was upset and didn't like their "test run", and I didn't blame her. At the very least, some debris from the building itself could have closed their entrance shut and they will have no way of escaping. Not to mention you need to stay away from downtowns , not go IN.