Tony Robinson: This is the Ypres Salient in Belgium. Ninety years ago during World War One it was one of the most dangerous places on the planet. More than a million men were killed or wounded within a few kilometres of this spot. In the open, even in the trenches, death was no more than a snipers bullet or an artillery shell away, which was why most of the hundreds of thousands of allied troops who served here spent as much time as they possibly could, underground.

They lived in dugouts, extensive underground bunkers with room to eat , sleep and escape the terrors of the war above. But although thousands were built along the western front, we know next to nothing about them, the men who built them, or life underground. Now though, in this Belgian cornfield, a team of archaeologists think they’ve found a dugout untouched since the end of the war, and they’re planning to excavate it.