the control 44 is provided with a plurality of valve members 143 and 144 which are selectively operable and each of which is associated with one of the operating components of the device such as a winch 16 a propeller operating motor 42a main motor pump 37 auxiliary jet control pump motor 42b a cutter motor 42c and the intake adjusting piston 41 each valve controls hydraulic pressure through a selected one of the hydraulic lines 35 from the power source 33 34 the jets 14 and 77 propellers 15 winches 16 and control valve 71 provide means to stabilize the hull and to manuever it in all planes thus some of the jets 14 may discharge streams of water in controlled directions to create a thrust manuever and stabilize the hull the propellers 15 may be selectively operated to create thrust which helps manuever and or stabilize the hull similarly the winches 16 may be selectively operated to exert a force below the center of buoyancy of the hull so as to utilize the cables and the anchors connected thereto at distances such as 1 000 feet from the hull to stabilize the hull in swift currents during tidal changes and to assist in swinging the hull from right to left and forward and backward when the hull is working over an area as a dredge it will be understood that the anchors of the cables 19 may be attached to surface vessels.