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Emily Blunt refused Steven Spielberg's offer to use AI for her alien voice in 'Disclosure Day'
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
She also speaks russian and korean in the movie, I hope it sounded fluent to native speakers too. As someone who doesn't speak those languages it was very convincing.
As someone fluent in Alien, I can confirm she sounded like gibberish, but the accent was on spot.