As many of the bombs dropped by the US and UK have time delay fuses that didn’t trigger, we will see bombs exploding in the ground in the decades to come.
Screwed into a bomb’s tail beneath its stabilizing fins, the fuse contained a small glass capsule of corrosive acetone mounted above a stack of paper-thin celluloid disks less than half an inch in diameter. The disks held back a spring-loaded firing pin, cocked behind a detonator. As the bomb fell, it tilted nose-down, and a windmill in the tail stabilizer began spinning in the slipstream, turning a crank that broke the glass capsule. The bomb was designed to hit the ground nose-down, so the acetone would drip toward the disks and begin eating through them. This could take minutes or days, depending on the concentration of acetone and the number of disks the armorers had fitted into the fuse. When the last disk weakened and snapped, the spring was released, the firing pin struck the priming charge and—finally, unexpectedly—the bomb exploded.
These style of fuses if not triggered back then, could instead trigger now as the paper decays from ageing, humidity and the like.
As many of the bombs dropped by the US and UK have time delay fuses that didn’t trigger, we will see bombs exploding in the ground in the decades to come.
https://www.smithsonianmag.com/history/seventy-years-world-war-two-thousands-tons-unexploded-bombs-germany-180957680/
These style of fuses if not triggered back then, could instead trigger now as the paper decays from ageing, humidity and the like.