German tunnellers driving a gallery with a mattock. Even at a distance of 50 metres the noise of their work was often discernible through geophones. Courtesy Spellmount Books

Published May 2, 2011 at 200 × 250 in Tunnelling Companies in the Great War
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German tunnellers driving a gallery with a mattock. Even at a distance of 50 metres the noise of their work was often discernible through geophones. Courtesy Spellmount Books

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