A commissioned documentary short showing the effort over several years to close off a shallow bay in the northwest Netherlands from the rest of the North Sea by engineering a dyke,with an area later turned into land after drainage.
| Directing | Joris Ivens | Director |
| Writing | Joris Ivens | Writer |
| Camera | Joris Ivens | Director of Photography |
| Production | Marcel L'Herbier | Producer |
| Camera | John Fernhout | Director of Photography |
| Camera | Eli Lotar | Camera Operator |