Note: Despite this official description, the game itself lists Firebase Hydra's location as being Arvuna. Firebase Hydra is located in an old abandoned quarian colony which humans took over when they originally settled the world of Ontarom. It has since been converted into a massive dam facility which powers the communications hub located at Firebase Dagger and the kinetic barrier which protects it. Without this critical power source, Systems Alliance communications within the entire theater would go dark.