I assume you are confused because you are imagining cockroaches surviving a direct hit from a nuke. They don’t, they burn up like everything else.
It is not the blast that is the real danger however, it is the radiation that spreads all over and ends the human race.
Cockroaches can survive high levels of radiation that people cannot. They are not alone, there are lots species out there that can survive way more radiation than a person. In reality cockroaches are not even all that resistant to radiation compared to other insects.
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