About this programme

2/2. The conclusion of the documentary about the dig exploring First World War battlefields near Messines in Belgium. Among the discoveries made by Simon Verdegem and his team are a cupboard full of German stick grenades, a case of British machine-gun bullets, artillery shells and hundreds of rounds of ammunition. Battlefield specialist Johan Vandewalle and his crew lower a camera more than 60ft down a German mineshaft - close to where one of the world's largest unexploded bombs is believed to be located. Benedict Cumberbatch narrates.