A modular cell that may be used with other cells to form a matrix under a load bearing feature, the cell being a single piece molding that supports a compressive load placed thereon, the molding including a void space defined within: a skirt shaped support member defining a substantially planar surface with an opening therein and at least one leg integral to and extending from the support member. The cell further includes at least one linking member that releasably links together multiple cells to form a matrix of cells. The cells may be linked together vertically and/or horizontally. The cell and matrix include greater load bearing capacity and rigidity through aligned legs to carry the weight and interlinking members that act to share the load among the various cells. The design is cheaper to produce and allows easy access of the void space for filling and laying utility lines.
