Gardline Geosurvey Limited was contracted to survey the proposed Walney Extension Offshore Wind Farm cable route. The geophysical data acquisition programme was carried out in December 2012 using the survey vessel M.V. Ivero, sailing from and returning to Barrow, to provide high-quality hydrographic and geophysical data (including bathymetry and seabed feature/target identification) to support offshore cable route development and installation planning.