Hamburg's ambitious dream is to build a world-class concert hall in the middle of a deafening harbour. It's a monumental engineering challenge. Years behind schedule and millions over budget, it's also a massive gamble...and there's no way to know if it'll pay off until it's finished.
In this segment, acclaimed acoustician Yasuhisa Toyota tests his design in an incredible 1:10 scale model of the finished concert hall. But this model is no miniature - it's bigger than some houses!
