The Daleks reasoned that the most dangerous planet in the universe, where no one would voluntarily land, would make the ideal base for their activities. (TV: Mission to the Unknown) It was not far from the nearly as hellish Desperus, a penal colony for prisoners. (TV: The Daleks' Master Plan) They transplanted deadly Varga plants from Skaro and also developed other carnivorous plants, such as the rosa toxicaera, to deter visitors. (AUDIO: The Rosemariners) They also established a Dalek city with its own spaceport.