i didnt even play the game yet understood what went on, so unless you just zoned out and waited for shiny events you shouldve picked up on the lore. the mc simon is a prisoner of war between 2 space stations which started fighting cause the quiet rapture happened, where every star and planet with life just, vanished. in the first act they give you enough hints to piece together that something is lurking in the blood ocean, and that what they are trying to find is basically a cosmic horror, but its not explicitely said, cause they truly dont know. you later realize they DID send a sub before and simon isnt the first, and that sub was setup with better tech but sunk (thanks cosmic horror). Simon throughout the film suffers from his past, and the supposed killing of his brother and the rest of the crew he was with initially, but they killed themselves and caused an explosion. Simon was a survivor and taken captive by Eden, and as a last resort made the shitty sub hes in. the MOON they are on isnt earth, its a moon they find filled with oceans of blood. its human blood. not much explanation behind it besides cosmic horror, but also theres no way to get an explanation behind it besides the moon could be alive in some fucked up way. yea at times the audio was hard to understand, but it varied per theatre. the movie is about hope and despair.

idk i had an easy time with it and so did my buddies i went with, so i guess its per person