| Original title | The silent enemy |
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| Danish title | Den tavse fjende |
| Other titles | Den tysta fienden |
| Leikstjórn | William Fairchild |
| Screenplay | William Fairchild |
| Based on | Efter marshall Pugh's bog "Commander Crabb". |
| Director of Photography | Otto Heller |
| Editor | Alan Osbiston |
| Composer | William Alwyn |
| Production designer | Bill Andrews |
| Appearance | Laurence Harvey, Dawn Addams, John Clements |
| Land | Storbritannien |
| Domestic distribution | ASA |
| Technical info | 35 mm, Normal, Sort-hvid, Tone |
| Danish theatrical release | 14.05.1959 |
| Cinemas | Kinopalæet |
| Danish rating | Forbudt for børn u. 16 år (1935-1969) |
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| Production company | Romulus, Remus, Bertrand Ostrer Prod. |
| Domestic distribution | ASA |
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Instruktion |
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| Instruktion | William Fairchild |
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Manus |
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| Manus | William Fairchild |
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Produktion |
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| Produktion | Bertrand Ostrer |
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Foto |
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| Foto | Otto Heller |
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Klip |
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| Klip | Alan Osbiston |
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Musik |
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| Musik | William Alwyn |
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Produktionsdesign |
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| Produktionsdesign | Bill Andrews |
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Medvirkende |
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| Medvirkende | Laurence Harvey |
| Medvirkende | Dawn Addams |
| Medvirkende | John Clements |
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