Zeta Hydronis Secundus system

The Zeta Hydronis Secundus system was a planetary system within the Forerunner ecumene. At the height of Forerunner power, the planetoids in the system hosted thriving colonies and impregnable fortresses, but during the Forerunner-Flood war the system fell before the parasite. In the post-Covenant War era, the UNSC found the system, designating Site C to one of a handful of intact Forerunner structures that remained.

Trivia
The system must be near the very edge of the Milky Way Galaxy, as the Andromeda galaxy is visible from Site C in good detail.

List of appearances

 * Halo 5: Guardians