It would be perfect if these documentaries had Greek subtitles along with Greek dubs.
There are plenty of movies and dramas with Greek subtitles (audio in English), but I don’t think that’s the best way to learn (at least for me). It’s more important for me to learn with my ears.
Sometimes, I wish there were more resources for learning Greek like there are a quite a few resources for learning “mainstream languages.” However, it can be fun to find my own methods and resources. It is delightful when I come across good ones.