The Story of London's Hidden Tunnels Beneath Big Ben

Beneath the most famous clock tower in the world lies a subterranean landscape almost nobody knows about. From a lost river still flowing under the Palace of Westminster, to medieval crypts that survived a fire which destroyed everything above them, to wartime tunnels connecting Downing Street to a nuclear bunker, to the extraordinary engineering operation that nearly toppled Big Ben in the 1990s, this documentary descends through six thousand years of hidden history beneath the Elizabeth Tower and the streets of Westminster.