Item #: SCP-XXXX Level 2/XXXX
Object Class: Euclid Classified


SCP-XXXX's main entrance.

Special Containment Procedures: The entrance to SCP-XXXX is to be closed off with a steel hatch, with guards patrolling an area of 150 meters around it. SCP-XXXX is disguised as an animal preservation area. Any instances of SCP-XXXX-1 attempting to leave the cave entrance are to be terminated immediately. Any non-Foundation personnel who find the cave entrance or explore the cave system are to be administered Class-B amnestics. SCP-XXXX must be monitored daily for any changes in behavior.

Description: SCP-XXXX is a cave located within the Wind Cave National Park in South Dakota, United States. The main section of SCP-XXXX has large biological growths protruding out of its walls, is approximately 10km long, ranges from 3 to 48m in height and 5 to 45m in width. Analysis of limestone and sandstone previously located within the cave has confirmed that SCP-XXXX originates from the Cenozoic era.

The width of the growths varies from 1 to 60m. Research indicates that the growths appear to function as a vascular system for a liquid visually and physically similar to blood1. Subjects have observed several biological structures which appear to resemble human organs, the most notable case being a 60-meter-tall heart suspended over the main section of the cave2, connected to various other segments of SCP-XXXX. Subjects unanimously report a feeling of being watched while inside SCP-XXXX despite no evidence of the anomaly nor its instances possessing optical organs.

Periodically, white, spherical, single-celled organisms 2.5 meters in height which display significant resistance to damage will appear in SCP-XXXX (referred to hereafter as SCP-XXXX-1).3. SCP-XXXX-1 is able to move using hundreds of thorn-like appendages on its body which it uses to roll itself, reaching up to 12.5/kph. SCP-XXXX-1 is aggressive towards any sentient carbon-based organisms in proximity to SCP-XXXX, and is capable of incapacitating an organism via anomalous absorption of the foreign body mass into its own; effects on the organism following this point are unknown. (See Addendum XXXX.2 and XXXX.3 for more details).


A picture of SCP-XXXX's main entrance walls.

Discovery: SCP-XXXX was discovered on 12/09/1973 after several reports of missing speleologists who were last seen before entering the cave system. Local police and researchers were sent to explore the area, causing six disappearances. The Foundation was subsequently notified of SCP-XXXX; Class-C amnestics were administered to employees of the Wind Cave National Park and the event was disguised as a coyote attack. This event is referred to in records as Event XXXX-1.

Addendum XXXX.1: Interview
Addendum XXXX.2: Exploration of SCP-XXXX
Addendum XXXX.3 Transmission Transcript