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.
You can now watch Letter Never Sent online on the following streaming providers in the United States.
| Directing | Mikhail Kalatozov | Director |
| Writing | Valeri Osipov | Writer |
| Writing | Viktor Rozov | Writer |
| Writing | Grigoriy Koltunov | Writer |
| Art | David Vinitsky | Production Design |
| Sound | Valeri Popov | Sound |
| Camera | Sergei Urusevsky | Director of Photography |
| Sound | Nikolai Kryukov | Original Music Composer |
| Costume & Make-Up | Lidiya Naumova | Costume Design |
| Camera | Yuri Zubov | Camera Operator |
| Sound | Arnold Roitman | Conductor |
| Writing | Valeri Osipov | Story |
| Camera | Pyotr Terpsikhorov | Camera Operator |
| Editing | N. Anikina | Editor |
