Nowadays, London's East End is synonymous with the 2012 Olympic Games. Cutting-edge engineering and design have transformed the Olympic Park. But 150 years ago, the world was watching for a very different reason, although the spectacle on display was as high-tech as anything on offer today.

The East End was once home to the most advanced shipbuilding industry - and best workers and shipyards - in the world.

A century and a half ago, Isambard Kingdom Brunel, Britain's most famous engineer, was about to launch a ship five times bigger than any that had ever been built before, the most revolutionary vessel the world had ever seen: the SS Great Eastern.

Pioneering the transition from sail to steam and timber to iron, Brunel and East London's ship builders created vessels that were bigger, faster and tougher than ever before.

But this launch was a disaster. Brunel went from hero to laughing stock overnight as his leviathan stuck on the slipway. Brunel died not long after.

Today archaeologists are scouring the banks of the Thames to discover why launching such a big vessel proved a complete disaster. Examining the slipways, they hope to discover what went wrong and how it affected shipbuilding in London for ever.

Tony Robinson joins them in their quest to solve the puzzle. But he and the team also explore some of the extraordinary successes of this long-gone industry and a time when the East End led the world.