DA-17

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DA-17 was a secret Dalek research facility constructed by the Dalek Empire.

Before the Dalek occupation of Earth ended, it had completed the development of a matter transmuter. It was this device that the Master attempted to steal, but the facility was laced with a booby trap. This trap contained a Dalek hatchery that began producing new Daleks once activated. (PROSE: Legacy of the Daleks)