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Aeons ago a Space Hulk filled with Orks on a Waaagh! (a huge Ork invasion) crashed into Angelis plowing a massive canyon, "Da Skid", and devastating the world's ecosystem. The Orks, a race who can survive just about any catastrophe, promptly decided that this wasn't the Waaagh! and resolved to find a way off-world as quickly as possible. They turned to their Mekboyz (Ork technicians, engineers, mechanics and the closest thing they have to scientists) for aid, who set the other Orks to work gathering up wreckage from the crash. Construction began on a huge machine, although what it was going to do differed depending on the ideas of the individual Mekboy.
The lack of unity in the construction and the machine's resemblance to a religious idol led to conflict amongst the Ork population. A religious schism occurred and factions formed based around whether believers felt the idol was of the Ork god Gork or Mork. The resulting violence destroyed the entire machine, forcing the Meks to broker an unsteady peace between the warring sides. From then on the machine would be known as Gorkamorka, at least until the day of completion.
Angelis was a suspected Necron tombworld, prompting Imperial efforts to assess the planet. At the time of the crash there were surveyors underground within the pyramids, an Imperial outpost, and an Imperial cruiser in orbit. The cruiser was brought down by the hulk with the disfigured descendants of the crash survivors became "Muties", while those inside the pyramids became primitive tribals known as "Diggas".