TON 618

TON 618, commonly known as Installation '06 and in official documents referred to as as Terran Orbital Network 618, is an array of space stations located in interstellar deep space. It is operated jointly by the Federal Navy and Department of Military Development. It is the most remote installation in galaxy, located over seven light years from the nearest star system. 
TON 618 is a secret development and testing facility primarily in usage by BEMiR and REX. All of its operations are classified, but it was revealed by an Affairs investigation on ADWs that the initial stages of Project 456 were conceived at TON. 
The facility itself is protected by the Terran 75th Fleet whilst the entry to the only pseudo-starlane leading to it is guarded by the Terran 67th Fleet. This makes it one of the best defended installations in the galaxy.
Initially named Military Research and Development Installation of Federal Importance N°6 or MRDI6, it was renamed to TON 618 at some point during the Great War due to the size of the installation. Despite this name which might suggest there were 617 similar facilities, it is the only facility in Terran space to follow such a naming scheme. It was named after the TON 618 hypermassive black hole, the largest object in the universe.