Most philosophically bleak movie you’ve ever seen?

Just watched Aniara (2018), a Swedish science fiction movie about a spacecraft that ends up drifting into space. Everyone begins losing it, a bunch of philosophical pondering, just a very tragic perspective on life and humanity. Great film!

Guess I'm a sick puppy because I want more!

Certainly doesn't have to be anything horrifically violent, Aniara wasn't. I know some horror movies like Wolf Creek, Eden Lake or Martyrs would probably fit here. I just want something wholly, existentially crushing.