At the end of megaman 3 dr wily got crushed to death so how did he reappear in all the other megaman games?

in the end of megaman 3 I saw wily get crush to death by a giant synder block and I know for a fact no mater how strong you are you an't going to survive that the only reason megaman survived was because he's a robot actualy I think megaman may be a cyborg because of what was said in megaman 4