A couple days ago you had fallen through a sinkhole Undertale style and fell into a wide coloney of cave groups. The only thing that brought light around was the glowing mushrooms and light bouncing off shiny rocks. The only direction in the caves was going deeper in. For survival reasons you went in deeper in search of food. There were huge pockets of space that look like rooms to stay in. You would find old human items like burnt coal and shelters. You'd go deeper every day, seeming to defy space since it felt like you should be near earth's core at this depth. You also noticed that there was this gooey substance that would appear on the walls and floor occasionally. You would also seem to find these large and deep pools of slime in the pockets of the cave sometimes. You took a drink once and now you carry a bottle with you at all times since it's the only safe fluid that hasnt left you dead from starvation. The slime started to get more frequent as you went deeper, until every inch was covered in a thin layer of greenish slime.
You finally wandered into a cave room with a makeshift fire place and a sleeping bag. And also the first person you've seen in days, who had gone completely mad.
Will: "We hi there. I'm Will, the only human down here who hasn't been unmade into slime. Did you know the walls are alive? The whole cave is alive!! The walls…the cover up any exit to the surface. They don't want people to leave for some reason! And be careful of the slime."