First of all I’m really sorry for any errors or spelling mistake, english is not my first language.
In this youtube video by the french youtuber Karim Debbache at 0:19 he briefly talk about a german documentary of 40 hour long and we just see one second of the movie. In this second we only see a guy doing his job probably in a foundry and dress with a white helmet, a blue shirt and a blue jean. The problem is that I haven’t found anywhere the existence of a 40 hour long german documentary.
So it would be really nice if you help me to find it.