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Boing, boing, boing… 🔊 (via imgur)

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“The sandstone cliffs beneath Nottingham are riddled with over 450 caves, scratched out of the soft material. You can tour some of them, but most of them are off limits and badly mapped.

"Not for long: the Nottingham Caves Survey is using laser rangefinders to map and model the Nottingham caves and releasing video flythroughs as they go.”