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 | Viktor Rozov | Writer |
| Writing | Valeri Osipov | Writer |
| Writing | Grigoriy Koltunov | Writer |
| Editing | N. Anikina | Editor |
| Camera | Sergei Urusevsky | Director of Photography |
| Art | David Vinitsky | Production Design |
| Sound | Nikolai Kryukov | Original Music Composer |
| Sound | Valeri Popov | Sound |
| Costume & Make-Up | Lidiya Naumova | Costume Design |
| Writing | Valeri Osipov | Story |
| Camera | Yuri Zubov | Camera Operator |
| Camera | Pyotr Terpsikhorov | Camera Operator |
| Sound | Arnold Roytman | Conductor |
