Catch up TV on Extreme Engineernig. Watch the latest and all other episodes of Extreme Engineernig now online, broadcasted on 7Two. Catch up on your favorite 7Two TV show: Extreme Engineernig. Replay tv on its best! Each episode of Extreme Engineering features a major construction and engineering project. Some projects are completed ones, like the new Hong Kong airport. Other projects are those under construction like the Gotthard Base Tunnel under the Alps.