A fatal game of cat and mouse
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Due to lack of air power and tanks, one innovative response to the attacker's problem was found: tunnel warfare
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It implied digging tunnels and placing mines and explosives beneath the enemy trenches and detonating them
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For the job of digging, tunneling companies were employed
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Professional miners are kept secret by the state. Companies operated in such secrecy that little was known for years after the war.
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Both the Germans and the Allied forces employed this tactic.
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That caused constant actions of mining and counter-mining, with both sides struggling to locate and destroy each other's tunnels.
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The only way of finding the enemies location was to listen quietly for the clink of shovels from the other side.
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The tunnels of two sides often came close to each other, and the tasks were to use smaller explosions to collapse the enemy tunnels. Faster miners stayed alive.
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Colliding with the enemy was disastrous!
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No covers to hide behind from gunfire and explosives
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Confrontations were often brief.
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The tunnellers biggest enemy was poison gas - the silent killer
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Of major importance was to make as little noise as possible - to prevent the enemy from detecting you.
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The Battle of Messines in 1917
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On June 7 the British attack on the Messines Ridge in West Flanders (south Belgium)
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The front length was around 14 kilometers
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The explosion of 19 mines beneath the German trenches signaled the start of the Battle
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455 tons of explosives was set throughout 21 tunnels
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the operation took over a year to prepare
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Tunnels were dug to a depth of 30 meters
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The explosion killed an estimated 10,000 Germans.
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Each individual explosion ripped a hole in the German defenses and destroyed everything above it
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A blast was so loud it was said to be heard in London, over 210 kilometers away.
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After explosion attack, it took just 3 hours for the British troops to take the German positions
Did you know?
The canary was the animal that served the British army as a primitive but effective method of detecting gas.
One unexploded mine remains undiscovered to this day.
The British had around 25,000 trained tunnellers.
ADDITIONAL INFO
http://www.bbc.com/news/magazine-13630203
https://dianaoverbey.wordpress.com/2012/02/08/tunnel-warfare-in-world-war-i/
https://defence.pk/pdf/threads/tunnel-warfare-in-ww1.382573/
http://manchesterhistorian.com/2015/sacrifice-in-the-tunnels-the-secret-war-of-ww1/
http://ww1centenary.oucs.ox.ac.uk/space-into-place/the-war-underground-an-overview/
https://digventures.com/2014/07/tunnel-warfare-world-war-ones-secret-underground-landscape/