The 4 season of Extreme Engineering was broadcast on from dimanche 19 février 2006 to mercredi 12 juillet 2006. It consists of 6 episodes, the first one is called "Super Stadium" and the last one "Space Tower".
Each episode of Extreme Engineering discussed some major construction project, some of them are projects that have already been completed like Hong Kong's airport. Others talked abount projects that are currently under construction like Tuneling Under the Alps. And some episodes talked about more futuristic projects that may never be done like the Transatlantic Tunnel. Most episodes finished by examining some sort of disaster scenario which could threaten or ruin the project that was being examined.