Filming on Game of Thrones season 8 filming has officially ended, meaning that the cast and crew can breath a little easier knowing they’re not in constant danger of revealing something they shouldn’t.

For example, Sophie Turner, speaking to Digital Spy, revealed the fake title the production gave Game of Thrones season 8 in order to keep leaks to a minimum. “It was Face of Angels,” she said. “It’s a random one!”

And that was hardly the only weird thing the show did in the name of secrecy. Turner confirmed what Nikolaj Coster-Waldau (Jaime Lannister) revealed last month: that the actors received self-destructing scripts.

Yeah, it’s all true. I mean, we wouldn’t get anything physical. We would have it on an app. We would get sent sides for the scene [we were shooting] the next day. So we would have to learn it all the day before. And once you’ve read it, it disappears 24 hours later, and you can never access it again. It’s tighter than the White House security!

And the security measures didn’t stop there. Turner explained that cast members were given code names “so that no-one knew who was really going to be on set.” What was Kit Harington’s (Jon) code name, we wonder? Brooding Bastard? Know Nothing? Or maybe something less obvious. Not-Kit Harington; that’d fool ’em.

Turner also revealed that visitors to the season 8 set “had stickers on their phones so that they couldn’t take photos.” Even Elon Musk and George Lucas?

To HBO’s credit, the season 8 set has been a good deal less leaky than the season 7 set. But ultimately, all the secrecy may be for nothing, at least if Turner decides to cut loose. “It’s hard for me, I’m such a blabbermouth!” she said. “I’m sure at a party I’ve probably spilled some beans to someone… probably to my mum!”

To stay up to date on everything Game of Thrones, follow our all-encompassing Facebook page and sign up for our exclusive newsletter.

Watch Game of Thrones for FREE with a no-risk, 7-day free trial of Amazon Channels