... is made up of the dredging bucket, chain, underwater big arm, upper and lower quadrangled wheel, active power, main ... The winch system: it is made up of the big arm lifting winch, bow rope winch, raised anchor winch, ... ship, mooring ship and submarine sliding and lifting arm upgrade. 6.Gantry: it is made up of ... of catamaran, the rise and fall of underwater arm etc.7.The hull and the hull facilities: ...