Two friends think that they've discovered a dangerous spy hiding in a mine shaft.
| Directing | Wadim Berestowski | Director |
| Writing | Edmund Niziurski | Writer |
| Writing | Edmund Niziurski | Novel |
| Camera | Kazimierz Wawrzyniak | Director of Photography |
| Art | Jan Grandys | Production Design |
| Sound | Stanisław Skrowaczewski | Music |
| Sound | Leonard Księżak | Sound |
| Editing | Halina Nawrocka | Editor |
| Costume & Make-Up | Tadeusz Schossler | Makeup Artist |
| Editing | Mirosława Garlicka | Assistant Editor |
| Art | Wanda Jakubowska | Supervising Art Director |
| Directing | Krystyna Cękalska | First Assistant Director |
| Directing | Stanisław Daniel | Assistant Director |
| Directing | Tadeusz Chmielewski | Assistant Director |
| Camera | Czesław Świrta | Camera Operator |
| Camera | Wacław Dybowski | Assistant Camera |
| Camera | Ludwik Pełka | Assistant Camera |
| Art | Zdzisław Kielanowski | Art Direction |
| Lighting | Jozef Ciecwirek | Lighting Technician |
| Writing | Ludwik Jerzy Kern | Lyricist |
| Sound | Stanisław Kochanek | Sound Assistant |
| Costume & Make-Up | Maria Lasnowska | Assistant Makeup Artist |
| Production | Mieczysław Wajnberger | Production Supervisor |
| Production | Tadeusz Slaby | Unit Manager |
| Production | Stanislaw Moroszkiewicz | Unit Manager |
| Production | Marek Dobrowolski | Unit Manager |