"This film was way harder than we expected," said Dunn, 35. "I think we went into it with the assumption that because we were focusing on a specific band and not an entire genre of music that it was going to be easier. It wasn't - at all. In terms of piecing together the story and establishing rhythm, it was a totally different challenge for us."
The filmmakers shot 500 hours of live performances and behind-the-scenes footage, which the band's crew brushed aside as if it were nothing. "They said we weren't hard enough," McFadyen, 40, recalled with a laugh.
"Being out on a tour like this, the anxiety you feel is that you might miss a golden moment," McFadyen added. "It was all-hands-on-deck. We shot each concert with five cameras, and in between shows, whether we were on the plane or in a police escort going to the hotel, we could have any number of four cameras going at once."
The film was financed by the band, yet Dunn and McFadyen still think they captured a side of their lives never before seen on film.
"It's a very visceral journey with Iron Maiden on this massive global tour," Dunn said. "We wanted to make a film Maiden fans could be proud of and give some insight into the band that they've never had before."
Access magazine recently conducted an interview with Scot McFadyen and Sam Dunn. Watch the chat below.