For troops serving on the front lines during World War I, was common practice. The use of machine guns and rapid-fire field artillery pieces forced soldiers on both sides, the Allies and the Central Powers, to bore intricate trench systems into the ground. These trenches served as protection against enemy fire and allowed soldiers to fire back without being fully exposed.

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Tunnels, on the other hand, were used to surreptitiously place explosives beneath unsuspecting enemy soldiers and move supplies between different parts of a battleground. In one known instance, a tunnel was used as an underground hospital.

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Trench warfare in World War I. Trench warfare reached its highest development on the Western Front during World War I (1914–18), when armies of millions of men faced each other in a line of trenches extending from the Belgian coast through northeastern France to Switzerland.