Wartime propaganda piece reporting on the success of the economic blockade of Germany in the early years of the war.
| Directing | Charles Frend | Director |
| Writing | Angus MacPhail | Screenplay |
| Production | Michael Balcon | Producer |
| Editing | Compton Bennett | Editor |
| Editing | Charles Crichton | Editor |
| Art | Thomas N. Morahan | Art Direction |
| Crew | Roy Kellino | Special Effects |
| Sound | Ernest Irving | Music Director |
| Camera | Douglas Slocombe | Director of Photography |
| Camera | Wilkie Cooper | Director of Photography |
| Sound | Richard Addinsell | Original Music Composer |
