- You may be looking for the Imperial Dalek section.
Section 3 was a section of the Dalek City. The Daleks in sections 2 and 3 were selected to receive anti-radiation drugs. However, the drugs resulted in the deaths of all the Daleks in section 3, while those from section 2 recovered in the sonic chamber. (TV: The Daleks)
When trapped on Skaro, Bernice Summerfield made her way through section 3, encountering a temporal ghost of one of the Daleks who had died after consuming the drug and ordering an evacuation of the section. (AUDIO: The Lights of Skaro)