"The School Underground"

A parallel universe with infinite space... what a great place to explore! A student of a school where kids learn about the Backrooms, a different universe consisting of nothing but yellow randomly segmented rooms and hallways and monsters trying to kill you every step you take, has weird flashbacks of the beginning of scientists' career of exploring this place. As adventures happen, Mike and his friends slowly unravel the past of the Backrooms and what is the reason the Backrooms were opened in the first place. And, believe me, the truth is astonishing...