Two promising young physicists, Sergey Krylov and Oleg Tulin, are studying a nature phenomenon like a thunderstorm from their student days.
Directed bySergey Mikaelyan
Written byDaniil Granin, Sergey Mikaelyan
CountrySoviet Union
Runtime149 min
On screen
Aleksandr Belyavskiy
Vasiliy Lanovoy
Rostislav Plyatt