A staple of best creepypasta lists everywhere, the title of this story itself carries with it a sense of dread and horror. Shortly after World War II, five political prisoners are subjected to an experiment in which they have to remain awake for 30 days in a tank filled with an experimental gas. As with most science-gone-wrong stories, the test subjects begin to lose their minds among a number of other gruesome symptoms. The horror does not end when the experimenters try to save their subjects — far from it.

Just know that this story may not be appropriate if you are squeamish or dislike gore, as the narrative goes into graphic detail about the physical state of the patients. Thankfully there are no pictures, or this would be the ultimate nightmare fuel.