That's far from the ultimate zip bomb. 42.zip has five layers. But you can make a zip file that has an infinite number of layers. See https://research.swtch.

That's far from the ultimate zip bomb. 42.zip has five layers. But you can make a zip file that has an infinite number of layers. See https://research.swtch.com/zip https://research.swtch.com/zip or https://alf.nu/ZipQuine https://alf.nu/ZipQuine