The true story of Australia's cat-and-mouse underground mine warfare—one of the most misunderstood, misrepresented and mystifying conflicts of WW I. It was secret struggle BENEATH the Western Front that combined daring engineering, technology and science. Few on the surface knew of the brave, claustrophobic and sometimes barbaric work of these tunnellers.

This series is loosely based on the real events of the 1995–2004 gangland war in Melbourne. It depicts the key players in Melbourne's criminal underworld, including the Carlton Crew and their rival, Carl Williams.