There’s a behind the scenes video, but what they did was they had an AI program watch tons of Nixon speeches to determine what his voice sounded like, had an actor deliver the speech, then had the bot change Nixon’s mouth movements (the visual they used was actually his resignation speech) and change the actor’s voice to Nixon’s.

It was done to raise awareness about deepfakes by creating what would have been a very memorable moment for the entire world that actually never happened.