For the French or German speakers here, there is an interesting 2013 Arte documentary on the subject: French: https://www.arte.tv/fr/videos/046598-000-A/le-sab

For the French or German speakers here, there is an interesting 2013 Arte documentary on the subject: French: https://www.arte.tv/fr/videos/046598-000-A/le-sable-enquete-sur-une-disparition/ https://www.arte.tv/fr/videos/046598-000-A/le-sable-enquete-... German: https://www.arte.tv/de/videos/046598-000-A/sand-die-neue-umweltzeitbombe/ https://www.arte.tv/de/videos/046598-000-A/sand-die-neue-umw... (I didn't find an English version or English subtitles for it, sorry...) It's available until September 18.