Game of Thrones' final season has famously been under incredibly tight security, and it seems to have paid off so far, with virtually no details leaking out.

However, one of its directors has opened up about shooting fake scenes and the lengths producers have gone to to keep the show's secrets hidden, comparing the protocol to the Nazi secret police.

Asked whether he knew when he was shooting fake scenes, David Nutter – who will direct three of the remaining episodes – told HuffPost: "Oh yeah. Oh yeah, of course."

HBO

He elaborated of the security: "Well, sometimes there were paparazzi in amazing places – on construction cranes and all kinds of crazy places, to try to get a point of view of things.

"They were all over, everywhere, trying to get in on what was happening. But it was definitely a situation where there was no paper on the set, [that] type of thing.

"[The production team] wanted to make sure nobody knew what was happening, and they went to the nth degree, like they do on the show in general. They basically take it to the point where it's like the Gestapo. It's tough to get answers."

HELEN SLOAN / HBO

Echoing some of the cast's comments on how the series ends, Nutter teased: "All I know is that [showrunners] David [Benioff] and Dan [Weiss] spent a lot of time to tell the story in a proper fashion, and the audience will be completely satisfied.

"Not everybody will be satisfied, but I feel the audience will be satisfied with the direction the series goes. It lives up to all the building it's coming to, I promise you that."

Meanwhile, the director recently confirmed that each episode of season eight would be longer than the standard episodes.

"Season eight episodes will all, I think, be longer than 60 minutes," he said. "They'll be dancing around the bigger numbers, I know that for sure."

Game of Thrones season 8 will premiere in April 2019. The show airs on HBO in the US and Sky Atlantic and NOW TV in the UK. Season 7 is now available to buy on DVD, Blu-ray or digital download.

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