It's one of the biggest construction projects in British engineering history. A new high-speed rail line costing several billion pounds and cutting through some of the most heavily developed land on the planet to complete a high speed link between two of Europe's major capitals: the Channel Tunnel between London and Paris. High Speed One's design and construction overcame unprecedented obstacles to achieve what many thought was impossible. Step aboard to explore the engineering behind this UK super train line. (thetvdb.com)