"To make the film, Wolf developed a complex system to index and identify the 70,000 tapes, which were all six to eight hours long. In the end, he only digitize

"To make the film, Wolf developed a complex system to index and identify the 70,000 tapes, which were all six to eight hours long. In the end, he only digitized 100 of the tapes and says those 700 hours are “a tiny scratch into the surface of what's there.”" Wow, what a treasure trove!