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During the Dalek Invasion of Earth in 2009, Martha Jones was given the Osterhagen key by General Sanchez before he was exterminated by the Daleks. (TV: The Stolen Earth) The Osterhagen Station would activate 25 nuclear warheads buried under the Earth's crust, destroying the planet. Martha teleported to this station and made contact with Osterhagen Station 5 in China and Osterhagen Station 4 in Liberia, as three Osterhagen stations were needed to activate the warheads.