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Mega Builders 6

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Explore the biggest, most complex and most dangerous building projects in the world, in the brand new sixth series of ‘Mega Builders'. Visit more busy construction zones to see how today's building projects are pushing the boundaries of design and engineering. Featuring behind-the-scenes tours, computer-generated imagery and in-depth interviews with engineers and their teams, each episode provides a fascinating insight into how these enormous and challenging projects evolve from blue prints into the finish structure. This series, return to the Swiss Alps to find out how the construction of the world's longest tunnel through the towering Gotthard Mountain range has progressed; follow two experienced steel crews as they race against the clock to finish the Aquatics Centre and the Orbit Tower before the 2012 London Olympic Games; and find out how close San Francisco's earthquake-proof bridge is to completion.