Young recruits Harry Blake and Charlie Yates had signed up for the infantry but ended up being sent to a tunnelling unit on the Western Front, part of a team of Royal Engineers - or "Sappers" as they were more commonly known.
Although the Sappers usually laboured beneath the trenches, rather than in them - their work was every bit as dangerous. And soon the pals realised that the fighting underground could be every bit as fierce as that on the surface...
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