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| Richard Dix | Richard McAllan | |
| Leslie Banks | Frederick 'Robbie' Robbins | |
| Madge Evans | Ruth McAllan | |
| Helen Vinson | Varlia Lloyd | |
| C. Aubrey Smith | Lloyd | |
| Basil Sydney | Mostyn | |
| Henry Oscar | Grellier | |
| Hilda Trevelyan | Mary | |
| Cyril Raymond | Harriman | |
| Jimmy Hanley | Geoffrey McAllan | |
| George Arliss | Prime Minister of Great Britain | |
| Walter Huston | President of the United States | |
| James Carew | Jim Barton | |
| Pat Fitzpatrick | Geoffrey - As a young child | |
| Jacqueline Giovanni | Young Girl |
| Director |
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| Producer | Michael Balcon
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| Writer | Bernhard Kellermann
Curt Siodmak |
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| Cinematography | Günther Krampf
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| Musician | Hubert Bath
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An engineer leads the building of a trans-Atlantic tunnel linking Britain and the United States. |
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