Very unusual film that keeps your interest to the end. At Cannes, this film shared honors of the second best film in competition with Farhadi's Iranian film "A Hero." I found this work to be far superior to the Iranian film. "Compartment no. 6" is based on a Finnish novel by a reputed lady novelist from that country. As I have not read the novel, how well the Finnish director adapted it is unclear. The performances of all the actors are convincing--especially that of the Russian miner (Yuriy Borisov) from start to finish. Definitely, one of my best films of 2021. Actor Yuriy Borisov had a small role in Zvyagintsev's "Elena," (the actor's debut in feature films)--and it is impressive for him to evolve into a major character actor in this film. He was evidently Zvyagintsev's discovery.