| Build time
| Built by
|| Armored, Structure, Biological
| Sight radius
Building the Ultralisk Cavern unlocks the Ultralisk and enables the player to research upgrades for it.
Deep within the shelled Cavern are numerous high-radiation deposits and dangerous substances. The extremely hostile environment within the cavern is what gives the mighty Ultralisk its unearthly toughness. Its genetic material has been subjected to countless tests and experiments, and only the final, viable code is used to provide Zerg Larvae with the key necessary to metamorph into a new Ultralisk.