Tunneller descending a shaft wearing Proto apparatus. A mouse or a canary would already have been used to detect the presence of carbon monoxide gas. IWM

Tunneller descending a shaft wearing Proto apparatus. A mouse or a canary would already have been used to detect the presence of carbon monoxide gas. This image shows Sapper 1057 Eugene Kelly (killed 11 April 1918) on duty with 3rd Australian Tunnelling Company in the Hulluch Tunnel near Loos-en-Gohelle. IWM

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