These devices were somewhat larger than a Human head and were capable of traveling through space in order to locate targets for the Asurans. One such device was sent to find the base of a group of rogue Asurans that had created a replica of Atlantis along with the Human expedition from Earth in order to study them in the hopes of learning the secrets of Ascension. The probe crashed into the replica city where it was destroyed by the rogue Asurans but not before it sent a data transmission to the dominant Asurans led by Oberoth who moved to destroy the city. (SGA: "This Mortal Coil")