Plot: Fred Dibnah's search to discover how the work of the builders and engineers of the past helped to shape Britain brings him close to his home town of Bolton, where the mid-18th century saw the building of the first canals and the arrival of the first civil engineers. He travels to Worsley in Lancashire to see where it all started - the labyrinth of 52 miles of underground waterways that carried coal from the Duke of Bridgewater's mines to the canal