1. The Mines of Ypres

The British successfully used a mining technique known as 'clay kicking' to plant mines under German tunnels during three battles in Flanders. 500,000 soldiers were killed for 900 metres of gains.

2. Monte Paterno

A personal account of the tragic battles that unfolded amid the sharp gullies and ravines of the Dolomites, requiring men to perform the nearly impossible: excavate and tunnel through solid granite in freezing weather.

4. Col di Lana

Exploring trenches and tunnels and interviewing descendants of the Austrians and Italians who fought under and above the treacherous terrain of the Dolomite mountains.

5. The Secret of the Somme

An exploration of newly discovered fortresses, dugouts, and bunkers tells the story of the innovative German engineering that made defenses resistant to massive bombardments.