Thought to be an alternate dimension relating directly in some ways to normal space or "Einstein Space." Also suggested to be the home of "Eaters," natives to the realms of Hyperspace that consume ships or objects that travel too near gravitic singularities while traversing hyperspace.[1]
It is suggested that Ol't'ro creates a unified mathematical theory to describe the physics of Hyperspace near the end of Fate of Worlds.
For related articles, see: Hyperdrive and Blind spot