Letters of last resort
Orders for action in the event of nuclear attack on UK
Letters of last resort
The letters of last resort are four identically worded handwritten letters from the prime minister of the United Kingdom to the commanding officers of the four British nuclear-powered ballistic missile submarines. The letters are stored sealed and unread on board each submarine. They contain orders on what action to take if an enemy nuclear strike has destroyed the British government. The letters exist because the UK is the only nuclear power with comparatively little territory and a concentrated population, which make it especially vulnerable to a nuclear attack. The letters are destroyed unopened and replaced upon every change in the office of prime minister, so that their contents remain known only to the issuer.
Read on Wikipedia · Image Michael Storey, OGL v1.0
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