In 1984, a Russian research team goes below the surface to find out what secret the world's deepest borehole is hiding. On their expedition, something unexpectedly gruesome awaits the researchers. Milena Radulović, Sergey Ivanuk, Nicholay Kovbas, Nikita Dyuvbanov, Vadim Demchog, Albina Chaykina, Kirill Kovbas Added on Amazon Prime 2023-10-31.