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A UNIT Safe House was located in South London.
The base served as an important component in Operation Double. If Osgood or her Zygon double were ever captured and interrogated for information they would divulge the existence of a weapon that could end the cease-fire known as the Osgood Box. The device was allegedly stored at the UNIT Safe House in a safe hidden behind a portrait of the First Doctor. The safe actually contained a decoy with a video message from the Osgoods elaborating on the purpose of the box and encouraging the reinstallation of the ceasefire. (TV: The Zygon Invasion/The Zygon Inversion)