Polaris missile

A  was a kind of nuclear weapon possessed by at least the British Royal Navy during the Cold War. They were launched from submarines. Somewhere in the South Pacific, either the Third or Fourth Doctor used a Dalek control frequency, which was enslaving the crew of the HMS Pandora, to order its captain to launch a Polaris along a 90-degree trajectory. Thus, the missile went up and came right back down along the same path. This caused the Polaris to hit the Dalek saucer and eliminate the threat it posed. Later, in a conference with Admiral Dunsford, the Doctor feigned ignorance over who might have ordered the Pandora to fire its missile. (DW: The Threat from Beneath)