Subsea excavation and suction device

Subsea excavation and suction device for complete submersion comprising a suction head movably attached to a hydraulic controller arm and having an inlet opening at a free, outer end and an outlet opening attached to a suction hose arranged at a distance from the inlet opening, said suction head having means for disintegration solid material and having a larger cross-sectional area at the inlet opening than at the outlet opening,

• the suction head comprising both hydraulic and mechanical means to disintegrate solid material, the hydraulic means comprising a plurality of primary jet nozzles arranged along at least one edge surrounding the inlet opening and having fluid communication with a source of pressurized liquid, and the mechanical means comprising at least one bar dividing the inlet opening into inlet sections, said at least one bar being shaped and dimensioned to effect a mechanic disintegration of solid sediment material.