Searching for London's lost rivers with Dr Tom Bolton

When people think of rivers and London, they think of the Thames. But the city was built around many other rivers too, and many traces of these can be found for those who know where to look. A secret network of underground rivers snakes beneath the capital. In some places they can be seen and heard. Rediscovering them and following their courses transforms the way we see London. Using the visual - and aural - clues hidden in the streetscape, we can burrow down through layers of London history to river level, revealing the city as it once was.