During the Second World War, following an ambush carried out in a fort by German troops, Eugène, an allied soldier, finds himself trapped underground. Now fighting for his survival, his destiny will play out alongside that of another survivor and both must find a way extricate themselves from certain death, unaware of the terrible battle that awaits them on the outside.

June 6, 1944. Several American paratroopers from the 82nd airborne land near the village of Graignes, 30 kilometers from their initial objective. Surrounded by an SS division, helped by the local population, they organize their defense.