Alveus Alpha Alpha Sextus
The vessel appeared in orbit around Ghazghkull's planet of Urk while its sun was dying. As the self-proclaimed prophet of Gork and Mork, Ghazghkull convinced the other Orks that the hulk's appearance was providential, just in time to carry them away from their doomed world and towards a glorious new Waaagh!
Ghazghkull loaded his Orks onto the hulk and drifted off towards Armageddon. He released it after landing on Armageddon, vowing he would not need it to escape, as he planned to conquer the planet entirely.