Set in German-occupied Norway, resistance fighter Knut Straud enlists the reluctant physicist Rolf Pedersen in an effort to destroy the German heavy water production plant in rural Telemark.
| Production | Benjamin Fisz | Producer |
| Directing | Anthony Mann | Director |
| Writing | John Drummond | Novel |
| Writing | Ivan Moffat | Screenplay |
| Writing | Knut Haukelid | Novel |
| Writing | Ben Barzman | Screenplay |
| Production | Maude Spector | Casting |
| Sound | Malcolm Arnold | Original Music Composer |
| Editing | Bert Bates | Editor |
| Art | Anthony Masters | Art Direction |
| Art | Ted Clements | Set Decoration |
| Camera | Robert Krasker | Director of Photography |
| Art | Robert Cartwright | Set Decoration |
| Camera | Ronnie Maasz | Camera Operator |
| Crew | John P. Fulton | Special Effects |
| Camera | Egil S. Woxholt | Camera Operator |
| Production | George Pitcher | Production Supervisor |
| Camera | John Harris | Camera Operator |
| Production | Jimmy Komisarjevsky | Location Manager |
| Directing | Egil S. Woxholt | Second Unit Director |
| Production | Timothy Burrill | Production Manager |
| Sound | Teddy Mason | Sound Editor |
| Camera | John Burrows | Camera Operator |
| Directing | Kay Mander | Continuity |
| Sound | Bill Daniels | Sound Recordist |
| Costume & Make-Up | Maude Onslow | Hairdresser |
| Sound | Gordon K. McCallum | Sound Recordist |
| Costume & Make-Up | Elsa Fennell | Wardrobe Supervisor |
| Costume & Make-Up | Neville Smallwood | Makeup Artist |
| Crew | Gerry Crampton | Stunt Coordinator |
| Production | Bill Kirby | Production Manager |
