https://ew.com/movies/oppenheimer-christopher-nolan-cillian-murphy-in-conversation/
"That's the only script that I've ever read that's been in the first person. It took me a minute, maybe a bit more than a minute, to figure that out. But then it became clear that you wanted it to be completely subjective, that everything was to be seen through the character's eyes as it were, and, again, yeah, that added massively to the terror"