This episode covers the story of nine experienced Russian hikers who died under suspicious circumstances in the Northern Ural Mountains between February 1st and February 2nd 1959.
https://interestingengineering.com/the-mystery-of-the-dyatlov-pass-incident
https://en.wikipedia.org/wiki/Dyatlov_Pass_incident
https://www.nationalgeographic.com/science/article/has-science-solved-history-greatest-adventure-mystery-dyatlov
https://dyatlovpass.com/cameras
https://www.amazon.com/Compelling-Force-Liam-Guillou/dp/B095SJJNQT