The First World War; a British Army platoon are delighted to be assigned to a quiet area of the trenches..front line, but quiet. Their first indication of a problem is when they meet the platoon they're relieving coming the other way...tensed, nervous, delighted to be away, apologetic to the new platoon, and, unusually, having left behind for them their accumulated goodies... but the trench seems fine, there's little activity from the German trenches...and the dug-out is good and deep. But in the dug-out, in the quiet of the night, they hear it...the muffled sounds of digging, from the German miners working far below...