Abstract: A stabilizing system for use in joining flanged pipe sections together in an underwater environment including at least one flange stabilizing element having a back plate portion with a support portion affixed thereto and extending orthogonally out therefrom a distance substantially in excess of the thickness of one flange, providing laterally spaced lines of support adjacent to the front of the flange at different vertical positions along its width defining a curved support tray area consistent with the curvature of the flanges of the pipe sections to be joined. At least one stub also extends orthogonally out from said back plate portion having a diameter less than the diameter of the bolt holes of the flanges.