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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- Admiralty Citadel
A huge, protected Second World fortress right in the middle of Central London, sat in between Horse Guards Parade and Saint James's Park.