backroom level0(3)

Hallucinations are common in Level 0, the most common being:
Humming from the lighting increasing to a deafening volume, then abruptly silencing.
The appearance of doors.
The appearance of stairs.
Acute déjà vu.
Human-like speech resembling no known language.
Movement in peripheral vision resembling insects crawling underneath the wallpaper, which disappears once the wall is observed directly.
Insect-like chittering.
According to analysis, the CO2 levels within Level 0 are rising at a steady rate. The significance of this is unknown.