Information

The remains of the Evereds Buildings at Site-21 after an attempt to send a remote drone to E-9056a7, an instance of SCP-4800-A.

Acentronura tentaculata. This species did not exist prior to an SCP-4800 occurrence in 2001.
Name: Midnight
Author: notgull
Rating: 289/351
Created at: Sun Jul 01 2018
Item #: SCP-4800
Object Class: Parauniversal
Containment Class: Keter
Special Containment Procedures
The process of SCP-4800 is not to be interfered with in any way. No effort is to be undertaken to explore instances of SCP-4800-A or communicate with them. Scranton Reality Anchors and other devices built to extract reality levels from alternate timelines are to be programmed to avoid targeting SCP-4800-A instances. These procedures have been unanimously agreed on by all instances of the SCP Foundation in the Multiversal Foundation Alliance.
In the event that a current timeline is subject to SCP-4800, all documents containing information pertinent to world history are to be migrated to a DEEPWELL server. No measures are to be undertaken to halt or reverse SCP-4800.
Efforts to contact Timeline E-2a0e8a129b are to continue.
Description
SCP-4800 is a presently unclear factor, force, or phenomenon responsible for the merging of parallel timelines. The exact cause of SCP-4800 is uncertain; however, it is hypothesized that [DATA REDACTED 5/MULTIU – SEE ADDENDUM 03]
Due to its nature, the inner process of SCP-4800 is difficult to observe. However, SCP-4800 can be observed from the outside, and proceeds as follows:
After SCP-4800, the resulting timeline will have elements of both instances of SCP-4800-A's histories. Events that the two timelines have in common will remain intact and not repeat1; however, individual elements2 will be included in the resulting timeline. No evidence of SCP-4800-related phenomena have been preserved; it is believed that SCP-4800 reverses the timeline to the beginning of the phenomena3.
SCP-4800 will generally target timelines with less than 43° of difference. No other common factors have been discovered in SCP-4800's choice of target universe. The current timeline has been the subject of several SCP-4800 events, which have been catalogued in Addendum 02. It is estimated that over 3000 timelines in the LTG4 are currently undergoing SCP-4800.
Addendum 01

Meeting of representatives of the Multiversal Foundation Alliance to decide upon a consensus definition of SCP-4800. Sensitive information expunged.
Discovery
SCP-4800 was first discovered after the Foundation was contacted by SCPF-7a5f7b5 in early 1986. SCPF-7a5f7b had been observing our timeline's history, and shared information that proved that several new events were present that had not existed before 1986. It was also shared that our universe had been inaccessible to them for 23 years, and that these events began to exist after this period.
However, SCP-4800 was first observed by the Foundation after the development of DEEPWELL servers6 in 1990. At this time, documents related to consensus world history were stored on DEEPWELL servers. Comparison between documents stored on DEEPWELL Server #987 and current consensus world history by AI construct ERIS.AIC revealed that several events had occurred that did not align with the past timeline. This, combined with evidence provided by SCPF-7a5f7b, led to the direct observation of E-5b0b3a and E-904ff2, two alternate timelines that were inaccessible for reasons unknown at the time. After the dissolution of E-904ff2 and the history modifications made to E-5b0b3a, SCP-4800 was classified.
Addendum 02
List of Known Occurrences of SCP-4800 in our timeline
Addendum 03
The SCP Foundation from universe E-909eaa has shared the following document with the Multi-U department. According to E-909eaa, the following document was encoded in a transmission that was sent from our timeline during an SCP-4800 event. It is unknown how this transmission managed to escape SCP-4800.
SCPs
Tales
Other
See my Author Page for more information.