When a bomb hits (and doesn’t go off) it can easily bury itself 6 or 7 feet underground. Other bombs go off around it at the same time – nobody drops ONE bomb in an attack – and then you get rubble and dirt on top of the unexploded bomb. Nobody knows it’s there – nobody’s outside watching to see which bombs go off and which don’t, they’re all with their heads down hoping they don’t get hit.
Time passes, and the earth has a habit of moving large objects like big rocks and such upwards. eventually over time the unexploded bomb is shallower than it was and someone hits it with a shovel and says “Mmmm- probably aught to ring the constabulary about that, whot whot” and there you go
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