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Use Underfoot to dive deep into the world beneath our feet, revealing details and connections between bunkers, mines, tunnels and caves , 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.

Create a custom KML file for Google Earth.

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

It has 98,239 pages on 60,837 sites, 292 classes, 10 subpages, 28 areas, 102 organisations and 18 publications.