Centuries ago, canals were the liquid highways of Britain, transporting raw materials and finished goods all over the country. Their arrival kick-started the Industrial Revolution, which was to turn Britain into a superpower. The very first water superhighway was the Bridgewater Canal, completed in 1761 to carry coal to Manchester from the mines in Worsley. Here, a team of archaeologists from Salford University roots out this industrial past, working with volunteers to excavate the very coal mine that inspired the creation of the canal