CLASSIFIED BRIEFING DOCUMENT U5ESOC-001: The "Erebus Fold" anomaly, discovered in 1987, refers to a spatial rift within the abandoned Cygnus-X bunker. Observers reported witnessing a "splintering" of architectural components, as if the structure's framework was being recalibrated by an invisible force. Walls would "slip" into non-Euclidean geometries, creating pockets of impossible space. Researchers attempting to map the phenomenon were met with "fugue states," experiencing vivid, disconnected memories not their own. The Fold's presence has been linked to localized distortions in chronology, with clocks nearby exhibiting erratic, "stuttering" timekeeping. Further investigation is hindered by the site's propensity for "ghosting," where entire sections of the bunker seemingly dematerialize and reappear at random.