Per 
WARNING:
SCP-XXXX IS RESTRICTED IN ACCORDANCE WITH SILV PROTOCOL
ESTIMATED EXPOSURE OF CURRENT USER:
7 Days, 11 Hours, 36 Minutes
Item #: SCP-XXXX
Still from Exploration XXXX-A: Embryophyta specimens discovered thirty meters beyond SCP-XXXX's tree line
Object Class: Euclid
Special Containment Procedures: SCP-XXXX is contained within conjoined with the facilities of Area-T90. As complete enclosure remains impractical due to SCP-XXXX's anomalous spatial properties, concealment and quarantine are to be prioritized. To date, 300 kilometers of concrete barriers have been raised to obscure SCP-XXXX and discourage civilian entry. These barriers are further augmented by adhesive tiles and particle filtration towers, to prevent particulate contamination. Loudspeakers emitting Gaussian white noise at 65 dB are spaced apart in fifty-meter increments along the barriers' outer face.
Any individual exposed to SCP-XXXX, materials derived from SCP-XXXX, and/or audiovisual representations of SCP-XXXX across a cumulative period longer than eight days is to be administered Class-B amnestics. Any renewed exposure to SCP-XXXX, materials extracted from SCP-XXXX, and/or audiovisual representations of SCP-XXXX—even after prior amnestics—will necessitate additional doses and, at the discretion of the supervising physician, a partial amygdalohippocampectomy.
Consequently, standard personnel may be stationed at Area-T90 for no more than eight days. All personnel assigned to Area-T90 will remain isolated in appointed clean-room cubicles on the third floor of operations bunker T90-West during leisure hours. In the event of heavy wind or rain, routine patrols will be suspended. Any personnel who express a reluctance to leave Area-T90 at the end of their assignment will be immediately amnesticized.
Every nine months, personnel and essential materials housed at Area-T90 will be evacuated to Area-T91 for a period of ten days. Construction crew CTF-003 (“سفينة نوح”) must be granted adequate materials to rebuild any and all structures absent from Area-T90 following this ten-day interval, up to and including the entirety of Area-T90.
Physical samples extracted from SCP-XXXX will be exclusively stored in the biomaterials annex of T90-West, except in the event of pre-scheduled evacuations to Area-T91. Audiovisual representations of SCP-XXXX are to be deleted from continuously monitored online platforms and electronic devices in accordance with the ongoing implementation of SILV Protocol. Copies of audiovisual media related to SCP-XXXX will be stored in vacuum-insulated servers on the ninth level of Site-15 (dfi:379182ATN) and must be reinstalled on a new hard drive every nine months. If any vessel used for the storage of materials related to SCP-XXXX—digital or analog—shows signs of independent motion, immediate incineration is authorized.
Return.
Description: SCP-XXXX resembles a ninety-three-acre grove of coniferous trees perched atop a sandstone mesa in northern New Mexico. A Gallery-class extradimensional membrane, SCP-XXXX possesses a spatial geometry incongruent with its apparent peripheral dimensions. Its internal bulk is host to several specimens of aberrant flora, fauna, and miscellanea (cf. Document XXXX-Lesko-Field Notes).
A precise period (8 days, 3 hours, and 37 minutes) of cumulative exposure to SCP-XXXX, materials extracted from SCP-XXXX, and/or audiovisual representations of SCP-XXXX will evoke a complex neuropsychological response in sapient subjects—a memetic cognitohazard. This response requires a minimal foothold via any of the five senses and will manifest regardless of a subject’s cognizance of SCP-XXXX (or associated materials) during the period(s) of exposure. For instance, incidental exposure to the scent of a small cluster of pollen grains (0.7 ppm) released from one of SCP-XXXX’s arboreal species was sufficient to evoke SCP-XXXX’s primary memetic effect in an unaware subject.
Once thus exposed, subjects will express a sudden desire to travel to the site of SCP-XXXX and enter the phenomenon's apparent tree line. Subjects will be willing to cross any distance, proceeding to SCP-XXXX without possessing any prior recorded knowledge of its existence. An affected subject may resort to tactics of manipulation or violence to achieve this aim, though this will depend largely upon the pre-existing psychological tendencies of the respective subject.
The Foundation first encountered the neuropsychological effect of SCP-XXXX on 14 March 2016 (Incident XXXX-1-CCCXIV). Though initially speculated to be a severe reaction to SCP-2812 beyond its previously established zone of influence, it was later determined that the affected individual had been exposed to SCP-XXXX through the conduit of SCP-XXXX-1C:
Report on SCP-5373-1
Although aerial and satellite imagery lend some credence to the limited perception of SCP-XXXX as a finite grove, both SCP-XXXX’s peripheral and internal dimensions have demonstrated a capacity for infinite or near-infinite extension. Additionally, all efforts to reach SCP-XXXX’s eastern tree line externally have proven fruitless. Any individual or equipment which attempts to circumnavigate SCP-XXXX from within visible distance of its perceived perimeter will be unable to complete a half loop around the grove. Instead, they will remain continuously on the same side (northern or southern) of SCP-XXXX as when they originally set out. This experience has been compared to “walking in place” or “walking on half a treadmill,” such that the landscape beyond the mesa appears to move at an increasingly slower rate the farther along the perimeter of SCP-XXXX one proceeds. Meanwhile, SCP-XXXX’s own visible perimeter will extend at a rate matching the relative speed of the observer.
To date, the tree line of SCP-XXXX has been mapped to a distance of 1035 kilometers, with exploratory teams departing from T90-West in both clockwise and counterclockwise directions. Any electromagnetic signals sent into the grove have not been able to reach an illusory “other side,” though certain signals have been found to echo back to their original transmitter after a 148-second delay.
Attempts to approach the eastern side of SCP-XXXX directly (i.e., from outside the visible boundary) have produced similarly unsatisfactory results. Exploration XXXXE-1 determined that, upon passing the boundary of visibility from an eastern direction, SCP-XXXX’s tree line appeared to advance towards personnel at a speed matching their own. All other observers were incapable of perceiving this change, and the tree line advanced without causing disruption to the geographic features of the mesa, passing through solid dirt and stone. At the halfway point (1.48 kilometers), In consequence, subject D-. In a second attempt (Exploration XXXXE-2), after contact was lost with D-D- ‘s corpse was recovered at the western base of the mesa after outside of Area-T90’s perimeter. Though D- ‘s adrenaline levels were heightened, any damage to their body was attributed to a fall from the mesa’s edge. Consequently, SCP-XXXX can only be approached on its western-facing sides.
Discovery: [Optional additional paragraphs]
Flora:
Explorations:
Special Decontainment Procedures: The following document is to be viewed only in the event of a CLASS-XK End of the World Scenario.
