A material transfer system (30; 30.1; 30.2; 30.3; 30.4; 30.5; 30.6; 30.7; 30.8; 30.9; 30.10; 30.11; 30.12; 30.13; 30.14; 30.15, 30.16) for moving material (184, 184.1, 184.2, 184.3, 184.4, 184.5, 184.6, 184.7, 184.8, 184.9, 184.10, 184.11, 184.12, 184.13, 184.14, 184.15, 184.16) in a body of water (32, 32.1, 32.2., 32.3, 32.4, 32.5, 32.6, 32.7, 32.8, 32.9, 32.10, 32.11, 32.12, 32.13, 32.14, 32.15, 32.16), the system including a reciprocating conveyor (96, 96.1, 96.2, 96.3, 96.4, 96.5, 96.6, 96.7, 96.8, 96.9, 96.10, 96.11, 96.12, 96.13, 96.14, 96.15, 96.16) which selectively moves in a first direction of movement (148, 148.1, 148.2, 148.3, 148.4, 148.5, 148.6, 148.7, 148.8, 148.9, 148.10, 148.11, 148.12, 148.13, 148.14, 148.15, 148.16) and a second direction of movement (186, 186.1, 186.2, 186.3, 186.4, 186.5, 186.6, 186.7, 186.8, 186.9, 186.10, 186.11, 186.12, 186.13, 186.14, 186.15, 186.16) opposite the first direction of movement, the reciprocating conveyor being configured to promote movement of said material in said first direction and inhibit movement of said material in said second direction, the reciprocating conveyor (96, 96.1, 96.2, 96.3, 96.4, 96.5, 96.6, 96.7, 96.8, 96.9, 96.10, 96.11, 96.12, 96.13, 96.14, 96.15, 96.16) including material displacement members (124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146; 124.1, 126.1, 128.1, 130.1, 132.1, 134.1, 136.1, 138.1, 140.1, 142.1, 144.1, 146.1; 124.2, 126.2, 128.2, 130.2, 132.2, 134.2, 136.2, 138.2, 140.2, 142.2, 144.2, 146.2; 124.3, 126.3, 128.3, 130.3, 132.3, 134.3, 136.3, 138.3, 140.3, 142.3, 144.3, 146.3; 124.4, 126.4, 128.4, 130.4, 132.4, 134.4, 136.4, 138.4, 140.4, 142.4, 144.4, 146.4; 124.5, 126.5, 128.5, 130.5, 132.5, 134.5, 136.5, 138.5, 140.5, 142.5, 144.5, 146.5; 124.6, 126.6, 128.6, 130.6, 132.6, 134.6, 136.6, 138.6, 140.6, 142.6, 144.6, 146.6; 124.7, 126.7, 128.7, 130.7, 132.7, 134.7, 136.7, 138.7, 140.7, 142.7, 144.7, 146.7; 124.8, 126.8, 128.8, 130.8, 132.8, 134.8, 136.8, 138.8, 140.8, 142.8, 144.8, 146.8; 124.9, 126.9, 128.9, 130.9, 132.9, 134.9, 136.9, 138.9, 140.9, 142.9, 144.9, 146.9; 124.10, 126.10, 128.10, 130.10, 132.10, 134.10, 136.10, 138.10, 140.10, 142.10, 144.10, 146.10; 124.11, 126.11, 128.11, 130.11, 132.11, 134.11, 136.11, 138.11, 140.11, 142.11, 144.11, 146.11; 124.12, 126.12, 128.12, 130.12, 132.12, 134.12, 136.12, 138.12, 140.12, 142.12, 144.12, 146.12; 124.13, 126.13, 128.13, 130.13, 132.13, 134.13, 136.13, 138.13, 140.13, 142.13, 144.13, 146.13; 124.14, 126.14, 128.14, 130.14, 132.14, 134.14, 136.14, 138.14, 140.14, 142.14, 144.14, 146.14; 124.15, 126.15, 128.15, 130.15, 132.15, 134.15, 136.15, 138.15, 140.15, 142.15, 144.15, 146.15; and 124.16, 126.16, 128.16, 130.16, 132.16, 134.16, 136.16, 138.16, 140.16, 142.16, 144.16, 146.16) each promoting movement of the material (184, 184.1, 184.2, 184.3, 184.4, 184.5, 184.6, 184.7, 184.8, 184.9, 184.10, 184.11, 184.12, 184.13, 184.14, 184.15, 184.16) in a first said direction and inhibiting movement of the material in a second said direction, with movement ranges of adjacent said material displacement members overlap; wherein the system includes a reciprocating drive mechanism (68, 68.1, 68.2, 68.3, 68.4, 68.5, 68.6, 68.7, 68.8, 68.9, 68.10, 68.11, 68.12, 68.13, 68.14, 68.15, 68.16) to which the reciprocating conveyor (96, 96.1, 96.2, 96.3, 96.4, 96.5, 96.6, 96.7, 96.8, 96.9, 96.10, 96.11, 96.12, 96.13, 96.14, 96.15, 96.16) is operatively connected, the reciprocating conveyor moving in a reciprocating manner via the reciprocating drive mechanism; and characterized in that the reciprocating conveyor (96, 96.1, 96.2, 96.3, 96.4, 96.5, 96.6, 96.7, 96.8, 96.9, 96.10, 96.11, 96.12, 96.13, 96.14, 96.15, 96.16) includes a loop-shaped carrying medium (100; 100.1; 100.2; 100.3; 100.4; 100.5; 100.6; 100.7; 100.8; 100.9; 100.10; 100.11; 100.12; 100.13; 100.14; 100.15; 100.16) to which the reciprocating drive mechanism (68, 68.1, 68.2, 68.3, 68.4, 68.5, 68.6, 68.7, 68.8, 68.9, 68.10, 68.11, 68.12, 68.13, 68.14, 68.15, 68.16) couples. wherein the system includes a reciprocating drive mechanism (68, 68.1, 68.2, 68.3, 68.4, 68.5, 68.6, 68.7, 68.8, 68.9, 68.10, 68.11, 68.12, 68.13, 68.14, 68.15, 68.16) to which the reciprocating conveyor (96, 96.1, 96.2, 96.3, 96.4, 96.5, 96.6, 96.7, 96.8, 96.9, 96.10, 96.11, 96.12, 96.13, 96.14, 96.15, 96.16) is operatively connected, the reciprocating conveyor moving in a reciprocating manner via the reciprocating drive mechanism; and characterized in that the reciprocating conveyor (96, 96.1, 96.2, 96.3, 96.4, 96.5, 96.6, 96.7, 96.8, 96.9, 96.10, 96.11, 96.12, 96.13, 96.14, 96.15, 96.16) includes a loop-shaped carrying medium (100; 100.1; 100.2; 100.3; 100.4; 100.5; 100.6; 100.7; 100.8; 100.9; 100.10; 100.11; 100.12; 100.13; 100.14; 100.15; 100.16) to which the reciprocating drive mechanism (68, 68.1, 68.2, 68.3, 68.4, 68.5, 68.6, 68.7, 68.8, 68.9, 68.10, 68.11, 68.12, 68.13, 68.14, 68.15, 68.16) couples.