Kevin Knight describes how a team developed a high-tech codebreaking AI called Carmel to crack the Zodiac cypher. Subscribe for more from Hunt for the Zodiac Killer and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the show and watch full episodes on our site: http://www.history.com/shows/the-hunt-for-the-zodiac-killer Newsletter: https://www.history.com/newsletter Website - http://www.history.com Facebook - https://www.facebook.com/History Twitter - https://twitter.com/history The Hunt for the Zodiac Killer Season 1 Episode 1 On "The Hunt for the Zodiac Killer," LAPD homicide detective Sal LaBarbera and a team of master codebreakers use their unrivaled expertise to bring the most mysterious serial killer in American history into the light. HISTORY®, now reaching more than 98 million homes, is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network’s all-original programming slate features a roster of hit series, epic miniseries, and scripted event programming. Visit us at HISTORY.com for more info.