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Item #: SCP-XXXX

Object Class: Safe

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St Hedwig's Cathedral, Berlin.

Special Containment Procedures: The entire building is to remain closed indefinitely to all non-Foundation personnel, under the guise of radiation clean up and decontamination. The building and its immediate environs are fenced off and signposted to this effect. This is supposedly in the aftermath of a terrorist attack by religious extremists, in which a dirty bomb failed to detonate correctly, contaminating only the interior of the church. A small onsite guard office is to be manned at all times, and is linked into a surveillance network which covers the entire building. Any Foundation personnel entering the building must wear a Type-1 Hazmat suit and adhere to correct decontamination protocol.

Description: SCP-XXXX is a previously concealed chamber, now empty, in the crypt at St. Hedwig's Cathedral in Berlin, Germany. All indications are that the chamber served as a containment unit for an unknown, anomalous source of neutron radiation. Presumably an entity of some kind, which is now at large.

The interior of SCP-XXXX is a regular octagonal room 6 metres in diameter. Each side of the octagon is made of a single slab of stone which has been extensively engraved with writings in a range of European languages. Much seems to have been deliberately defaced by whomever broke into the tomb. The ceiling and floor are also each made of a single slab of stone, though they have no writing on them. In the centre of the floor is a standing stone which extends approximately 2 metres above the ground. The central stone, as well as the walls, floors, and ceiling of the room, are composed of the metamorphic rock Serpentinite. Notably, Serpentinite has seen use in some nuclear reactor designs as neutron shielding.

That which is bound to life, we bind to the Earth, with fetters from the heavens.

-Translated from a small, undamaged section of wall

SCP-XXXX-1 is an unknown metal alloy found embedded within the stonework of the walls. Use of ground penetrating radar proved a latticework of this metal to be present in all walls, the floor, and the ceiling. The metal is an alloy, primarily of Iridium and Osmium; neither element had been discovered when this chamber was constructed. There are several other trace elements present in the alloy including Iron, Cobalt, and Copper. Approximately 1.5% of this materials' mass [REDACTED]. Initial testing reveals the material to be anomalously effective at blocking ionising radiation. Within the sensitivity limitations of the detectors used, it appears to be 100% effective. Further testing required, pending O5 approval.

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An example of Widmanstätten patterns in a polished and etched iron meteorite.

SCP-XXXX-2 consists of several lengths of chain coated in a thick layer of frost. Based on fragments of the translated writings and observations of Widmanstätten patterns in the metal, it is theorised that the chains are made from so-called meteoric iron. The chains maintain a steady temperature of 165 Kelvin (-108 degrees Celsius)1 at all times, regardless of any external temperature changes.

Several links have been severely damaged, appearing to have been burnt through. How this was done is unknown, as the chains have so far resisted all efforts to remove a sample for study or to otherwise damage them.

Freshly spray painted in red on the standing stone using a stencil is SCP-XXXX-3 - an unidentified heraldic coat of arms which incorporates a mild cognitohazard. When seen for the first time, it causes the viewer to speak the phrase [REDACTED] with great conviction. Additional graffiti sprayed across the walls in the same paint reads “All prisons are temporary”. Whether this phrase is a reference to the Foundation or simply a reference to this particular prison is the subject of much speculation by researchers.

Discovery: The chamber was hidden behind a nondescript stone wall in keeping with the rest of the architecture and incorporated into the original foundations of the building. This suggests it was part of the original construction, though no such records exist. The Cathedral was burned down by an incendiary bomb during WWII which almost completely destroyed the main structure and heavily damaged the crypt. SCP-XXXX seems to have survived both the bombing, and the extensive reconstruction and restoration work that followed, undamaged and unfound. It is hypothesized that it was protected from exterior tampering and/or discovery by anomalous means. The breach of the room released radioactive dust and particles into the rest of the building. Emergency services attending the aftermath of the initial anomalous activity have been treated for radiation poisoning and administered Class-A amnestics. Despite some severe cases of radiation poisoning, no one died from initial exposure.

The room was only discovered when an as yet unidentified group raided St. Hedwig’s, specifically targeting SCP-XXXX. Reports differ, but at least four individuals entered the Cathedral and proceeded to attack everyone within St. Hedwig’s leaving only two survivors, both in critical condition. An explosion was heard2 by members of the public outside the building, at which point the emergency services were alerted. Some of these witnesses reported seeing a bright blue/white flash, several describing it as a 'flash of lightning', in conjunction with the explosion. No one was seen leaving the premises. See Incident Report XXXX-Alpha for further details and eyewitness reports.