Mexican family living between a rock and a hard place
22 January 2013 Last updated at 18:13 GMT
As a boy, farmer Benito Hernandez came across a cave in the remote arid region of Coahuila in Mexico, and decided that one day he would make it his home.
And for the past 30 years he and his family have been living in it, supporting themselves by harvesting a variety of local desert bush.
Daniel Gallas reports.