Offshore Wind Consultants Limited (OWC) completed supervision and management of the onshore and overwater cable route site investigation for the East Anglia ONE offshore wind farm. The investigation covered onshore, overwater in the Deben estuary and offshore locations (up to 14 km offshore) and combined a geophysical survey with geotechnical investigations including CPTs and cable percussive/rotary boreholes, carried out from a jack-up, pontoon and an offshore vessel.