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It uses recursive compression . The main file contains 16 zipped files; each of those contains another 16, and so on, through five layers. The final layer contains a single 4.3 GB file filled entirely with zeros.
While modern computers won't "explode," attempting to unzip this file will quickly fill a hard drive to capacity or cause the extraction software (and potentially the OS) to hang or crash. 42.zip
It is a tiny ZIP file, only in size, that contains an astronomical amount of data—roughly 4.5 petabytes (4,500 terabytes)—when fully uncompressed. It uses recursive compression
