Watch an iron lung video before seeing the movie!! (Trust me, because I didn't)

I just got out of the movie and purposefully stayed away from any media about the game because I didn't want ANY spoilers. Now that I've seen the movie I'm watching gameplay and only 10 minutes in, the movie makes alot more sense. At the start of the movie, I missed the part about what the quiet rapture was, and was a bit confused about the map Simon had. Even if you just watch the first 10 minutes of an iron lung video, I do strongly suggest watching it first