Underground: Tales of Hacking, Madness and Obsession on the Electronic Frontier is a 1997 book by Suelette Dreyfus, researched by Julian Assange.

It describes the exploits of a group of Australian, American, and British black hat hackers during the late 1980s and early 1990s, among them Assange himself.

The book also mentions other hackers who had contacts with the protagonists, among them Erik Bloodaxe of the Legion of Doom and Corrupt of the Masters of Deception.

The first chapter of Underground relates the diffusion and reactions of the computer security community to the WANK worm that attacked DEC VMS computers over the DECnet in 1989 and was purportedly coded by a Melbourne hacker.

[3] The 2002 documentary In the Realm of the Hackers, directed by Kevin Anderson and centered on Phoenix and Electron, was inspired by this book.