Item #: SCP-XXX
Object Class: Safe
Special Containment Procedures: No particular safety measures are necessary, although security must be maintained at the site in order to prevent the public from becoming aware of its existence.
Description: SCP-XXX is a circular tunnel 2.5m wide lined with volumes of books. The full extent of the tunnel is unknown, though Interferometric Synthetic Aperture Radar (IfSAR) has set a minimum depth of 299,792km or 1 light-second (expeditions have confirmed a depth of at least 4,441km). The conjecture has been advanced that the tunnel may be infinite.
The volumes lining the tunnel often resemble known works, fictional or otherwise, though with substantial alterations as to style, character, plot and subject matter. Authors are occasionally authentic ones (though in every case the volumes in question fail to have ever been written), though often they are wholly unknown. The works range from being at the very least unusual to completely non-sensical. All languages currently extant as well as extinct ones are represented (see the section Recovered Works). In no case has any volume borne any publication information. Dating techniques have established that the volumes originate from the era they would otherwise appear to, based on semantic and linguistic analysis. The arrangement of the volumes follows no discernible pattern.1
The walls of the tunnel are made of limestone. Attempts at breaching them have shown that the tunnel is non-Euclidean: excavating through the floor of the tunnel, for instance, results in a corresponding hole appearing in the ceiling. Attempts at reaching the tunnel at an angle have proven futile as the tunnel appears not to exist unless approached from its entrance.
SCP-XXX was discovered in 1989 by a librarian in an unused basement of La Biblioteca Nacional de la República Argentina located in Beunos Aires. Foundation personnel administered class B amnesics to those who had been made aware of its existence and cordoned off the basement under the guise of performing emergency structural restoration.