That is very interesting information.
I will try and find the name of that show. It was SO informative. Musharef of Pakistan forced AQ Kahn to apologize to the nation for his underground Nuclear workshop and distribution when Pakistan didn't want other nations to have the bomb or the technology. Iran specifically benefited from AQ Kahn and in the documentary, they show how Kahns smaller tubes for the enrichment process enables them to be hidden much easier. Such as the underground Iranian facilities we hear about.