a rov remote operated vehicle then jacks 63 on the module can be operated to push up the pump module against a plate 66 that lies under a ballast sleeve 70 of the bottom structure to trap the pump module between plates 66 74 the ballast sleeve 70 contains ballast which resists upward movement of the pipe lower end the ballast sleeve has a ballast sleeve passage 72 that is aligned with the module sleeve passage 64 and with the lower end 20 of the pipe an inlet plate 74 extends across the bottom of the bottom structure and has a screen covered opening 76 aligned with the passages of the module sleeve and ballast sleeve so water can flow up to the pipe in a straight line applicant adds at least one heave damping plate 80 to the bottom structure the damping plate adds weight and adds water resistance to vertical movement to resist heave of the pipe lower end the plate lengthens the natural period of vertical oscillation of the pipe each vertical water facing surface 82 of the plate preferably has at least 50 of the area within the pipe electrical power for energizing the pump and operating the jacks is obtained through an electrical cable 84 the cable extends along the outside 86 of the pipe which facilitates cable installation and repair fig4 and 5 illustrate how the pipe top 90 is mounted to a stationary portion 92 of a pipe coupling assembly 94 the stationary portion 92 is the turret 32 in the system of fig1 and is the entire barge body in the case of the system of fig1 a the stationary portion 92 is stationary in that it does not move with respect to the floating body or with respect to a turret.