This documentary shows the construction of a high-altitude dam by the Sabbioni Glacier, and the daily struggles of the workers, now anxious for the outbreak of a mine, now silent for the nostalgia of the distant family.
| Directing | Ermanno Olmi | Director |
| Writing | Silvano Rizza | Writer |
| Sound | Pier Emilio Bassi | Original Music Composer |
| Production | Ugo Franchini | Production Manager |
| Production | Walter Locatelli | Production Secretary |
| Editing | Carla Colombo | Editor |
| Camera | Carlo Pozzi | Director of Photography |
