The old Billingsgate Fish Market closed in January 1982, and the most important waterfront site in Europe was available for examination by the Museum of London. Would they find traces of the Great Fire? Of the medieval church that once stood there? Of the Norman, Saxon, even Roman waterfronts? The site has been occupied for nearly 2,000 years - but was it continuous? Did the Saxons take over as soon as the Romans left? Chronicle followed the excavation for two years to produce an unprecedented Diary of a Dig and recorded the archaeologists' work against time to rescue historical evidence before the foundations of an office block destroyed the site for ever.