to the lower most end of the support device and then as the stabilizing mixture fills the chamber the line may be raised as necessary those skilled in the art can envision other ways in which the stabilizing mixture can fill the chamber of the outer tube now referring to fig3 a an enlarged section of the support device 10 u2032 is shown specifically illustrating one manner in which holes or perforations may be made in the outer tube 12 in fig3 a the openings 30 are formed by creating moon shaped cutouts thereby leaving a chad or tab 34 the chad or tab 34 would be pushed away from the exterior surface of the outer tube 12 as the pressurized stabilizing mixture exited the interior chamber of the outer tube alternatively holes could be drilled or punched in the outer tube 12 in order to create an opening by which the stabilizing mixture could flow through those skilled in the art can envision other ways in which openings may be formed through the outer tube 12 in order to facilitate flow of stabilizing mixture therethrough to create the external stabilizing features 32 fig4 illustrates use of the subsurface support of the invention to stabilize a sloping surface in the figure three support devices 10 are illustrated and are spaced from one another in a desired arrangement to best support the sloping surface the support devices are disposed in a horizontal orientation but it shall be understood that the support devices may be placed at any angle or orientation depending upon the surrounding terrain the support devices in fig4 would be representative of use of the supports.