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For more on marking an answer as the "Best Answer", please visit our FAQ.Can't be clever and give you the web page link, but key in Suberranea Britannica Do have a look at their website, even if you don't fancy joining.
They visit masses of underground man-made things. There is a special section devoted to military bunkers which you will see from their Home Page. That group organise a lot of visits often at times and to parts not available to the general public - although things are a lot easier to visit these days.
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