http://www.soton.ac.uk/mediacentre/news/2008/jan/08_06.shtml
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Dunwich, fourteen miles south of Lowestoft, was once a thriving port, and in the 14th century similar in size to London. However, storms, erosion and floods over the past six centuries have almost wiped out this once prosperous city, and the Dunwich of today is a quiet coastal village.
The project will use the latest underwater acoustic imaging technology to assess the existence of any remains from the city that lies between 10ft (3m) and 50ft (15m) down.
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Diving evidence suggests the site contains debris from at least two churches and a priory, but underwater visibility at the location is very poor, and no one has any idea what remains (if any) exist from the medieval settlement that was lost in the 13th and 14th centuries.
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The city-scale survey of the sea floor will provide information on the location and state of any structures of archaeological interest in relation to historical records. The findings will be presented as a new public display for the Dunwich Museum, documenting the technology used and what the project has revealed of the lost city.
52º 16’ 42.40” N 1º 38’ 1.01” E