The Fourth Doctor thought the station (or parts of it) was built in the late 29th or early 30th century. (TV: The Ark in Space) The Fourth Doctor and Leela visited Nerva at the very beginning, when it was a space dock orbiting Jupiter. They became involved in events surrounding an infection by the Drelleran in revenge for the actions of Lord Jack Corrigan. (AUDIO: Destination: Nerva)