![Never-before-seen images of 'Birdsong' tunnels dug by British pit workers to undermine the German lines in First World War | Daily Mail Online Never-before-seen images of 'Birdsong' tunnels dug by British pit workers to undermine the German lines in First World War | Daily Mail Online](https://i.dailymail.co.uk/i/pix/2012/01/27/article-0-116B56D6000005DC-170_634x430.jpg)
Never-before-seen images of 'Birdsong' tunnels dug by British pit workers to undermine the German lines in First World War | Daily Mail Online
![The War Below review – plucky shot at telling amazing story of wartime tunnellers | Movies | The Guardian The War Below review – plucky shot at telling amazing story of wartime tunnellers | Movies | The Guardian](https://i.guim.co.uk/img/media/ba2258e2748d355dd8bea0f40e290dc92b3be815/0_34_1638_983/master/1638.jpg?width=1200&height=1200&quality=85&auto=format&fit=crop&s=149b5c75268a9632b1ee52de56d01071)
The War Below review – plucky shot at telling amazing story of wartime tunnellers | Movies | The Guardian
![CLAY KICKER Digging technique used in laying tunnels - here for sewers under Manchester in 1915 Stock Photo - Alamy CLAY KICKER Digging technique used in laying tunnels - here for sewers under Manchester in 1915 Stock Photo - Alamy](https://c8.alamy.com/comp/F8TXHW/clay-kicker-digging-technique-used-in-laying-tunnels-here-for-sewers-F8TXHW.jpg)
CLAY KICKER Digging technique used in laying tunnels - here for sewers under Manchester in 1915 Stock Photo - Alamy
![Never-before-seen images of 'Birdsong' tunnels dug by British pit workers to undermine the German lines in First World War | Daily Mail Online Never-before-seen images of 'Birdsong' tunnels dug by British pit workers to undermine the German lines in First World War | Daily Mail Online](https://i.dailymail.co.uk/i/pix/scaled/2012/01/27/article-2092768-117D6269000005DC-799_308x185.jpg)