In April 1945, Winston Churchill ordered the British Chiefs of Staff to rip up the rule book and plan for an attack on their wartime ally, Russia.
It was audacious, inconceivable and incredibly risky.
So, fittingly, it was codenamed Operation Unthinkable.
Just how close did we come to launching the Third World War in 1945?
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The theme music is Newsroom by Riot.
The other music featured in this episode was Cylinder Seven and The Life and Death of a Certain K. Zabriskie, Patriarch, both by Chris Zabriskie and Sunset by Kai Engel. All tracks are licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/).