The Craziest Film Set in the History of Film?

Ok, now this is nuts. This jaw-dropping GQ article goes behind the scenes of Russian director Ilya Khrzhanovsky's insane magnum opus Dau, a film which has been shooting for 5 years with no clear intention of stopping. But that's only the start of it. You need to read the entire piece to fully appreciate the magnitude and craziness of this undertaking, which involves a self-contained community under totalitarian rule. If this is true, it would be the most bizarre film production ever, like a real-life Soviet version of Synecdoche, New York or something...