The desert sun heats the white sand relentlessly, even though it is twilight. Life here seems to be monotonous as day turns to night and the sand dunes move from one place to another, and only the distant sounds coming from deep underground suddenly paint the image of a secret city hidden from humans' eyes.
These sounds intensify as you approach to a mysterious object that seems to be growing in the middle of the desert. On its surface rises a pipe, releasing vapors of air. At this point it becomes clear that this is not just a sand hill, but a ventilation shaft, which enables the whole underground world to be functioning.