Abstract: An underwater pylon cleaning apparatus is disclosed in which a rigid suction conduit mounted on an oceangoing vessel includes an eductor therein for providing a suction or lower pressure at the conduit inlet when water under pressure is supplied by a pump to the inlet of the eductor. A flexible hose connects an intake nozzle having an opening adapted to conform to the lateral surface of a cylindrical pylon to the inlet of the suction conduit. A discharge hose is connected to the outlet of the suction conduit by a flexible hose so that a diver may position the intake nozzle against the marine growth attached to the pylon whereby the growth will be removed from the pylon, transported through the hose and suction conduit and expelled through the outlet hose.