Fine-scale seismic data have allowed archaeologists to develop a detailed 3-D model (left) of where the Arun River in southern England flowed when the sea level was lower and the EnglishChannel was dry land. This model helps guide researchers as they retrieve samples from the ocean floor (above) in search of artifacts, fossils, or vegetation that can help reconstruct the history of the ancient landscape. 30 * January/February 2007 ARCHAEOLOGY