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The original Backrooms image posted on 4chan, of a HobbyTown under renovation.. The Backrooms are a fictional location originating from a 2019 4chan thread. One of the best known examples of the liminal space aesthetic, the Backrooms are usually portrayed as an impossibly large extradimensional expanse of empty rooms, accessed by exiting ("no-clipping out of") reality.
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Suddenly a humanoid figure darts towards him, and he barely escapes through a crawlspace. After this, he travels through strange tunnels with warped stop signs and another red-lit city, eventually coming across a house in the middle of a room. Inside, he hears a man speaking on a phone. He explains that he is trapped in the Backrooms and needs ...
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A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
A sanitary sewer is an underground pipe or tunnel system for transporting sewage from houses and commercial buildings (but not stormwater) to a sewage treatment plant or disposal. Sanitary sewers are a type of gravity sewer and are part of an overall system called a "sewage system" or sewerage .