An Unknown Compelling Force is a 2021 American documentary film about the Dyatlov Pass incident, an event in which a group of nine Soviet hikers, led by Igor Dyatlov, died in the northern Ural Mountains between February 1 and 2, 1959, under uncertain circumstances. The film is written and directed by Liam Le Guillou.An Unknown Compelling Force was released on digital platforms by 1091 Pictures on June 15, 2021.