Hydroman Offloading Submersible Dredge Pump Description: Hydroman Offloading Submersible Dredge Pump is also called Submersible agitator dredge pumps, it is a single suction submersible sand pump that allows solid to be drawn. Submersible dredge pump is the kind of heavy duty submersible mud pump that is applied for the dredging process to transport underwater sand, slurry, sludge, gravel or other sediments to specified place.