A vacuum-type unloader for ships and barges. Pneumatic unloaders like this one from Belgian company Vigan, can draw up to 600 tonnes per hour of dry granular solids like coal, alumina, grain, cement, etc. A 9-metre extension for the vertical suction tube is also available on the DLS (see kuid2:68213:27027:1). You can use that to adjust the length of the tube to suit the elevation of the ship being unloaded.