A group of engineers have taken one of the biggest challenges of this year's Olympics - the construction of a complex steel-truss roof for the new Aquatic Centre.
Shaped like a giant ocean wave, the London Olympic Aquatic Centre roof is a high-tech wonder. 3,000 tonnes of steel will rest on only three points, like a tripod, leaving a 115 metre span of the roof totally unsupported. The fabricators and construction crews have no room for even a millimetre of error. Only gold-medal perfection will do.