**_What happened to nine Russian hikers on Dyatlov Pass in early February, 1959?_** British-American documentarian Liam Le Guillou travels to the area in question in the northeast Ural Mountains to talk to the locals and examine the best theories as to why the nine athletic Russians (seven men and two women) left their tents in the freezing cold of the night without adequate attire, with most perishing of hypothermia far away and a few others revealing signs of blunt force trauma. “An Unknown Compelling Force” (2021) is worthwhile for learning about the nine victims, as well as the inacce...