The exterior of SCP-XXXX, surface level.

Class: Euclid

Special Containment Procedures: No human entry into SCP-XXXX is allowed except for the purposes of monthly maintenance and cleanup, in which case time spent in the interior should be minimized and is never to exceed forty-five (45) minutes total for any individual. The surrounding area is to be cultivated and modified as necessary in cooperation with the United States National Park Service to minimize tourist activity near the area. A metal door and frame that are resistant to environmental damage have been installed into a brick wall barring the entrance. The interior of SCP-XXXX is to be measured and tracked for maximum potential length and a rough estimate of total volume monthly via remote drone. In the event of an earthquake or other natural disaster, SCP-XXXX is to be measured as soon as possible and the surrounding area is to be imaged for potential new cave formations or sinkholes, which are to be filled in expediently.

Any and all sightings of SCP-XXXX-1 are to be reported to the nearest available level 3 research personnel. Any direct contact with SCP-XXXX-1 is to be recorded, and witnesses are to be treated with Class-B amnestics. Following event XXXX-Son-Doong (see Addendum-03), Foundation personnel in potential hotspots have been briefed on SCP-XXXX-1 and provided training in the use of amnestics where necessary.

Description: SCP-XXXX is a subterranean cave network only accessible through a singular surface entry located in Barren County, Kentucky, encompassing a total volume of an estimated ████ cubic meters.1 The initial entry from surface level leads to a set of tight cave tunnels, at times less than 0.5m in diameter, before increasing in size into a large central chamber, roughly cylindrical and approximately 15m in diameter. This central chamber branches out into between three (3) and seventeen (17) tunnels, varying in length, width, level and orientation. Any other subterranean space that is contacted by these tunnels is absorbed into the total volume of SCP-XXXX.2

SCP-XXXX-1 is a level 3 Humanoid Apparition, location-bound, conceptually-bound,3 free-roaming, passive, benevolent. SCP-XXXX-1 is the wraith of a local cave explorer who died in the interior of SCP-XXXX on the 13th of February, 1925. This specter is bound to the interior of SCP-XXXX, bound to subterranean cave networks and cannot appear above ground. It appears to roam independently throughout the Mammoth Cave National Park System, returning periodically to SCP-XXXX.