First, all ammunitions have a chance of not exploding. This is known as the dud rate. Artillery shells for example, have a dud rate of between 4 and 6% (or over 20% for Russian ordinances). This is not unexpected due to manufacturing defects, and the way the munition impacts the ground. However, because a cluster bomb is filled with so many submunitions, known as bomblets, there will be more that don’t explode, even though the dud rate is lower (2%). It is worth nothing that unexploded bomblets are not like land mines, they will generally not explode when you walk over then, but they are still dangerous.
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