A bunker is a manmade underground structure which is often reinforced to withstand attack.
Bunker rang in size from small four man ROC Posts to vast underground cities.
Little Sodbury - An Royal Observe Corp post.
Burlington - A huge underground city.
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Paddock was Winston Churchill's alternate Cabinet War Room bunker for World War II, constructed in 1939 but only visited once by the Prime Minister before it was abandoned in 1944.