All the Dyatlov theories share a basic assumption that the full story has not been told. In a place where information has been as tightly controlled as in the former Soviet Union, mistrust of official narratives is natural, and nothing in the record can explain why people would leave a tent undressed, in near-suicidal fashion. For decades, the families and the Dyatlov Group Memorial Foundation pressed for a new investigation; two years ago, elderly relatives of several victims finally succeeded in getting the case reopened.