in  2012 The National  Trust acquired Fan Bay near Dover, this was also the site of a precursor to modern RADAR, the iconic Sound Mirrors.

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The sound mirrors and associated tunnel complex in the hillside behind, were buried after the military left the site.

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High Peak Geotechnical ltd were commissioned to re-excavate and restore the tunnels, to create a visitor access to the sound mirrors.

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The tunnels were engineered in the style of the original excavations, using reclaimed railway sleepers to provide support.

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The result was a sympathetic restoration which provides a realistic visitor experience.