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.
| Actor | Role |
|---|---|
 Willeke van AmmelrooyNot listed | Not listed |
| KKarel KneulmanNot listed | Not listed |
| GGerrit KouwenaarNarrator (Dutch version) (voice) | Narrator (Dutch version) (voice) |
 Yves MontandNarrator (French version) (voice) | Narrator (French version) (voice) |