6.30/10 2014-08-29 45 minutes.HDn Georgia, Mark believes that the U.S. is under the threat of foreign occupation, specifically by Russia. He's building a modern Trojan horse in order to infiltrate a potential enemy base undetected. In Texas, Joe is preparing for a cyberattack to take out the country's telecommunications system. His current projects include a post-apocalyptic schoolhouse to be used to educate children if the government collapses after disaster and "gyro-copter" in order to maintain aerial dominance.An: 2014Studio: National GeographicPays: United States of America