A pumping system for moving a liquid, or a mixture of a liquid and one or more objects (P), from a collector device (2； 2′) submerged in a body of water (W), to a receiving facility (31) comprises a first delivery line (7), a second delivery line (11) and a pump unit (9). The pump unit (9) is submerged in the body of water (W) at a first depth (d) below the water surface (S) and arranged between the collector (2； 2′) and the receiving facility (31). The first delivery line (7) is fluidly connected between the collector device (2； 2′) and a pump unit inlet (18). The second delivery line (11) is fluidly connected between a pump unit outlet (17) and the receiving facility (31). The pump unit is thus configured to generate suction in the first delivery line (7) and a positive pressure in the second delivery line (11). Suction in the first delivery line (7) may be increased by increasing the first depth (d) and/or by opening of the adjustable valve (30).
