At one point they were just like filling the actors crossing a river on some slimy stone, and it clearly was not a studio, but an actual river. And there would've been like a 5 meter fall had they slipped properly. There was a branch or something they were holding onto, but I can see that with extremely bad luck, some of those scenes could've gone horribly wrong if anything went wrong.

Although I do wonder if actors are like allowed to nowadays. I would like to. Some crazy director-producer would put me in crazy dangerous shit just to catch it on film. I'd like that.