This stuff is no longer valid, but read it if you want to.
Read instructions you can read this for my theories that are down here. So the parasite theory was correct as we can see. We don't yet now how they get infected, but I think it might revolve around the fire of '67. We can see the blood tentacles are coming from the infected. Tentacles are usually come from octopuses, but these ones might be from the depths of the underworld. If there is a horror game with fire you can safely bet it's from the underworld. The fire came from the underworld to stop the NASA scientists from finding the truth. Thats why NASA is so terrified of it because they were close to finding it out. I think the main character aka @User85121_135 was the only survivor of that fire. All of the other scientists died from the fire. Why aren't we told this you ask because @User851216_135 wants to surprise us. The infected come from the underworld to take us all. BUT a different contradicting theory is the scientist started the fire, and the infection. Why though because they don't want us to know more, but @User851216_135 ( I am going to shorten it to User ) had a family member or a friend who worked their, and is now attempting to find why the reason the fire was started. Now to seem less sus NASA is now reopening it years after the fire, or to kill User for knowing so much. Is NASA this corrupt or is the underworld trying to kill us. But hey thats just a theory a game theory and cut. Uh I got some new info yeah it's from the underworld.