It consists mainly of about 1,750 metres (m) of boreholes at sea at several sites in the area under study, using a dynamically positioned drilling vessel (MSPOV Kingfisher) equipped with a piggyback coring system and a re entrable seabed system, which can eliminate or reduce the limitation of the drilling length inherent in the length of the tidal periods of currents navigable by the drilling vessel, as was the case in previous surveys.