Old Photograph The Tunnellers Friends Memorial Edinburgh Scotland

Old photograph of The Tunnellers Friends Memorial in Edinburgh Castle, Edinburgh, Scotland. Tunnellers’ Friends Memorial, Scottish National War Memorial, Edinburgh, showing mice and canaries in a cage. Unveiled in 1927. Both sides in the First World War dug tunnels so they could explode mines under the enemy’s trenches. The tunnellers took canaries and mice with them to give early warning of methane or carbon dioxide as the creatures were quickly affected by toxic gases.



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