![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)
Never-before-seen images of 'Birdsong' tunnels dug by British pit workers to undermine the German lines in First World War | Daily Mail Online
![TIL that during WW1, explosions in France were heard in London. A team of miners worked in secret to dig tunnels under the German trenches during the war in order to plant TIL that during WW1, explosions in France were heard in London. A team of miners worked in secret to dig tunnels under the German trenches during the war in order to plant](http://www.wwi-models.org/Photos/Events/y2006/ipms_nats/07-figures/IMG_5405.jpg)
TIL that during WW1, explosions in France were heard in London. A team of miners worked in secret to dig tunnels under the German trenches during the war in order to plant
![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-2092768-117B84CD000005DC-35_634x583.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
![Clay-Kicking or Working the Cross | Nottinghamshire Mining Museum - a history of Nottinghamshire Mining Clay-Kicking or Working the Cross | Nottinghamshire Mining Museum - a history of Nottinghamshire Mining](https://www.nottsminingmuseum.org.uk/wp-content/uploads/2020/11/claykicking.jpg)