Four geologists are searching for diamonds in the wilderness of Siberia. After a long and tiresome journey they manage to find their luck and put the diamond mine on the map. The map must be delivered back to Moscow. But on the day of their departure a terrible forest fire wreaks havoc, and the geologists get trapped in the woods.
Unfortunately the movie Letter Never Sent is not yet available on HBO Max.
| Directing | Mikhail Kalatozov | Director |
| Writing | Grigoriy Koltunov | Writer |
| Writing | Viktor Rozov | Writer |
| Writing | Valeri Osipov | Writer |
| Editing | N. Anikina | Editor |
| Art | David Vinitsky | Production Design |
| Camera | Sergei Urusevsky | Director of Photography |
| Sound | Valeri Popov | Sound |
| Sound | Nikolai Kryukov | Original Music Composer |
| Costume & Make-Up | Lidiya Naumova | Costume Design |
| Writing | Valeri Osipov | Story |
| Camera | Pyotr Terpsikhorov | Camera Operator |
| Sound | Arnold Roytman | Conductor |
| Camera | Yuri Zubov | Camera Operator |
