This geophysical and sampling survey has been undertaken by University College of North Wales (UCNW) for Natural Environment Research Council (NERC), the survey took place in June 1993 in The Wash on board the MV Petroswift. The purpose was to collect data as part of the NERC Land-Ocean Interaction Study (LOIS). British Geological Survey were a participant in the study. Sea floor data were collected using echo sounder. Sub-bottom profiling data were collected using surface tow boomer. Sample data were collected using mini Van Veen Grab Sampler. Navigation positioning Trisponder system. These data are archived by UCNW. Survey details are contained in University College of North Wales report “Geophysical studies in the Humber and Tees Estuaries and the Fenland/Wash area by A. M. Davies, J. D. Bennel, J. Butcher, C. Hartfall, I. Richarson and B. Williams”. NERC contract F60/G12/15.