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| Cast |
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| Richard McAllan | DIX, Richard |
| Frederick 'Robbie' Robbins | BANKS, Leslie |
| Ruth McAllan | EVANS, Madge |
| Varlia Lloyd | VINSON, Helen |
| Lloyd | SMITH, C. Aubrey |
| Mostyn | SYDNEY, Basil |
| Grellier | OSCAR, Henry |
| Mary | TREVELYAN, Hilda |
| Harriman | RAYMOND, Cyril |
| Geoffrey McAllan | HANLEY, Jimmy |
| Prime Minister of Great Britain | ARLISS, Mr George |
| President of the United States | HUSTON, Mr Walter |
| aviation financier (uncredited) | PARSONS, Percy |
| oil financier (uncredited) | HAYE, Helen |
| Jim Bardon (uncredited) | CAREW, James |
| Geoffrey as a child (uncredited) | FITZPATRICK, Pat |
| technician (uncredited) | MacLEAN, Ian |
| announcer (uncredited) | SMITH, Cyril |
| . (uncredited) | FISHER WHITE, H. |
| . (uncredited) | GIOVANNI, Jacqueline |
| . (uncredited) | GENN, Leo |
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| Credits |
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| Directed by | ELVEY, Maurice |
| Presents | Gaumont-British Picture Corporation |
| Controlled by | Gaumont-British Distributors Ltd. |
| Producer (uncredited) | BALCON, Michael |
| Production Supervisor (uncredited) | BALCON, S.C. |
| Scenario and Dialogue | Du GARDE PEACH, L. |
| Additional Dialogue | DANE, Clemence |
| Screen Story | SIODMAK, Kurt |
| Based on the novel 'Der Tunnel' by | KELLERMANN, B. |
| Photography | KRAMPF, G. |
| Camera Assistant (uncredited) | MASSEY-COLLIER, Gerry |
| Editor | FREND, C. |
| Art Director | METZNER, E. |
| Dresses | Schiaparelli |
| | STRESSNER, J. |
| Musical Director | LEVY, Louis |
| Sound (uncredited) Recordist | ROSE, M. |
| Recorded on | British Acoustic Film |
| Studio | Shepherd's Bush Studios |
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