A new rail link under London is helping to rewrite history

Relics of the past are also being unearthed in London. Crossrail is Europe’s biggest infrastructure project: a new 118 kilometre long rail link passing underneath the city. When it’s finished in four year’s time, Crossrail will bring London’s transport system into the 21st century. But it’s also shedding light on the city’s past. Stephen Beard has the details.