Large tunnel-creating machines, known as Groundborers, were produced by Akin-Dower. Their purpose was to quickly establish shelters on hazardous planets. During the Freedon Nadd Uprising, a number of these machines were acquired by a faction of affluent Naddists. Warb Null utilized altered Akin-Dower groundborers in his assault on the Onderon city of Iziz. Consequently, following this incident, they gained the moniker Onderonian War Machines.