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Underfoot allows you to explore details and connections between bunkers, mines, tunnels and caves. Use it to research sites, connect to fellow enthusiasts or just plan a grand day out. Sites have descriptions, maps, photo albums, timelines, links to heritage resources, powerful filters and targeted searches.

Part of the Expounder family of websites. It does not host much original content, but uses Wikidata as a backbone to display Wikipedia and Wikimedia data and link to other sites in a friendly fashion.

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  overview
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  custom searches
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  timeline
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  Wikipedia
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  gallery
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  table

For example Subterranea Britannica have visited Fan Bay Deep Shelter and the Ramsgate Tunnels.

Suggestions for improvement, including new data sources or display methods, welcome, contact John Bray

It has 98,341 pages on 61,212 sites, 324 classes, 11 subpages, 29 areas, 159 organisations and 18 publications.