With unprecedented access to the bridge, aided by champion climber Lucy Creamer, Jonathan scales all over to the bridge to investigate the innovations and techniques used to build this incredible structure inspired by £1000 from a wine importer.

Jonathan climbs over 300 feet to investigate the revolutionary design and perches atop the massive and revolutionary chains that make it all possible. He descends 35 feet to discover Brunel's massive secret chambers in the towers that remained undiscovered until 2002, and he hangs exposed 245 feet above the river Avon to reveal the Victorian engineering which prevents disaster by expanding and contracting, just as Brunel devised.