You may be looking for Archimedes.

Archimedes was a planet which was home to a human colony owned by the Fountain Corporation.

UniMedia reporter Huksley went there to investigate the Fountain Programme and discovered a connection between it and a number of strange deaths on the colony. The Seventh Doctor, who had arrived in Huksley's flat, helped her uncover the truth, which was that her story was a hoax manufactured by UniMedia to increase their ratings. (PROSE: The Infinity Season)

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