Abstract: The disclosure relates to a suction generation device for the removal of matter from a submerged surface, including: a housing including a fluid inlet, a suction inlet, an expulsion outlet, and defining a cavity therein; the fluid inlet being configurable to direct a supply of fluid into the cavity and to establish a flowpath from the fluid inlet to the expulsion outlet, the flowpath extending through the cavity, and fluid flow in the flowpath generating a reduction in pressure at the suction inlet to generate a flow of fluid therethrough and into the flowpath; and the fluid inlet includes an array of inlet fluid ports. The disclosure further relates to an operation apparatus for the suction generation device and a method for the removal of matter from a submerged surface.

Abstract: A device comprising a body; at least one propulsion unit fixed to the body and configured for moving the device along a sea bed; a collection unit having an inlet opening and a fluid channel extending from the inlet opening; a transport pipe fluidly connected to the fluid channel; and a fluid conveyance unit arranged in connection with the fluid channel and/or the transport pipe and configured to generate a fluid flow from the inlet opening to the transport pipe. There is also provided a method for removing sea floor sediments below a fish farm and a method for sea bed harvesting.

Abstract: A suction generation device, comprising a fluid supply port and a suction port in fluid communication with an expulsion port and a matter collection arrangement to receive a fluid from the expulsion port; the suction device comprises a suction conduit connected to the suction port and a handheld appliance that assists in collecting matter in a fluid; the suction generation device configurable to receive a fluid supply at the fluid supply port and flow to the expulsion port that reduces pressure at the suction port to cause a fluid flow through the suction port carrying solid particles entrained therein; the suction generation device is configured to combine the fluid supply and the fluid flow to form the expulsion fluid, and direct the expulsion fluid through the expulsion port into the matter collection arrangement configured to hold a proportion of the solid particles entrained in the fluid flow therein.

Abstract: A device comprising a body; at least one propulsion unit fixed to the body and configured for moving the device along a sea bed; a collection unit having an inlet opening and a fluid channel extending from the inlet opening; a transport pipe fluidly connected to the fluid channel; and a fluid conveyance unit arranged in connection with the fluid channel and/or the transport pipe and configured to generate a fluid flow from the inlet opening to the transport pipe. There is also provided a method for removing sea floor sediments below a fish farm and a method for sea bed harvesting.