DescriptionTunnel entrance, National Library of Wales - Geograph-3886266-by-Ian-Capper.jpg
English: In the rock under the National Library of Wales is a tunnel, built by the library as a bomb-proof depository to be used in the event of war. During the Second World War the British Museum was invited to make use of the facility and 100 tons of books, manuscripts, prints and drawings were transferred there for safe keeping.
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