Breached Reality

The Breached Reality is an alternate quantum reality created by a warp core breach extremely near a temporal anommaly. It was split off in 2366.

Pre-split
In 2366, the USS Enterprise-D was investigating a temporal rift. While examining the anommaly, the USS Enterprise-C emerged, resulting in an altered timeline where the United Federation of Planets was still at war with the Klingon Empire. This timeline was supposedly destroyed when the Enterprise-C went back through the rift, but the Enterprise-D experienced a core breach that was induced by Klingon attacks. The breach cause a divergance in the timeline, and the Breached Reality was formed. (TNG:"Yesterday's Enterprise")

Post-split
In 2270, the USS Enterprise-E was launched, captained by Captain Johnathon Shelby. It was assigned on a mission to investigate a potential Klingon weapons cache in the Briar Patch Nebula.