Documentary on "City 40" in Russia

I just saw a documentary on Netflix, released July 2016, on the hidden city of Ozersk in Chelyabinsk Oblast. This was the secret location of the Mayak plant where weapons grade Plutonium was (is?) manufactured in Russia. It was not on any map for the longest time, and is still surrounded by fences and guards (see Wikipedia article) . The film was taken with a hidden camera and includes interviews with some of the workers. There are numerous interesting stories including covered-up accidents. It is called "City 40" and was directed by Samira Goetschel. Very interesting.