In the 1960s, the United States government built a moonbase on the far side of the Moon using alien technology.

It was named after U.S. President Dwight D. Eisenhower. The moonbase was designed to contain a viable minimum population. In the event of a nuclear war, the plan was for its inhabitants to eventually return to Earth and rebuild human civilisation. It was destroyed by the Sixth Doctor on 23 November 1963. (AUDIO: 1963: The Space Race)

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