The Hydra system is a UNSC-controlled star system. It was the site of the Hydra System Massacres,[1] and many insurrections, of which the UNSC were not afraid to use Nuclear Weapons to put down.[2]

Its name may be an reference to the constellation Hydra, possibly located within the constellation. It may also be a reference to the famous Greek sea monster Hydra.



  1. Halo: The Fall of Reach, pages 20-21
  2. Halo Encyclopedia