Instructional film about the (former) biggest harbour in the world, with a hybrid format. Well known Ivens themes are revisited, like The Flying Dutchman in the fiction part of the film, who returns to the modern day Rotterdam, that has recovered very well after the devastating bombardments in the second world war.
| Directing | Joris Ivens | Director |
| Writing | Joris Ivens | Writer |
| Writing | Gerrit Kouwenaar | Writer |
| Camera | Étienne Becker | Director of Photography |
| Camera | Eduard van der Enden | Director of Photography |
| Editing | Andrée Choty | Editor |
| Editing | Catherine Dourgnon | Editor |
| Editing | Geneviève Louveau | Editor |
| Sound | Constantin Simonovitch | Original Music Composer |
| Sound | Pierre Barbot | Original Music Composer |