A cable sealing structure comprising: first and second cable sealing bodies (34, 36) that meet at a cable sealing interface, the first and second cable sealing bodies (34, 36) including a gel block (30, 32); and the first and second cable sealing bodies (34, 36) each including at least one reinforcing structure embedded in the gel block (30, 32)of each of the first and second cable sealing bodies (34, 36); wherein as the cable sealing structure is deformed to form a seal about a cable at the cable sealing interface, the at least one reinforcing structure of each of the first and second cable sealing bodies (34, 36) elastically deforms to apply an elastic load to each of the first and second cable sealing bodies (34, 36); wherein the first and second cable sealing bodies (34, 36) each include an x-dimension that extends along an x-axis, a y-dimension that extends along a y-axis, and a z-dimension that extends along a z-axis, wherein the z-axis corresponds to a cable pass-through direction through the cable sealing interface, and wherein the first and second cable sealing bodies (34, 36) are each less deformable along the z-axis as compared to both the x and y axes; and characterized in that: the at least one reinforcing structure of each of the first and second cable sealing bodies (34, 36) is a three-dimensional block matrix that is embedded into the gel block (30, 32) of the first and second cable sealing bodies (34, 36), the three-dimensional block matrix providing a self-supporting shape of the at least one reinforcing structure and having inherent elastic characteristics configured to provide internal spring loading within the gel block (30, 32) during sealing. first and second cable sealing bodies (34, 36) that meet at a cable sealing interface, the first and second cable sealing bodies (34, 36) including a gel block (30, 32); and the first and second cable sealing bodies (34, 36) each including at least one reinforcing structure embedded in the gel block (30, 32)of each of the first and second cable sealing bodies (34, 36); wherein as the cable sealing structure is deformed to form a seal about a cable at the cable sealing interface, the at least one reinforcing structure of each of the first and second cable sealing bodies (34, 36) elastically deforms to apply an elastic load to each of the first and second cable sealing bodies (34, 36); wherein the first and second cable sealing bodies (34, 36) each include an x-dimension that extends along an x-axis, a y-dimension that extends along a y-axis, and a z-dimension that extends along a z-axis, wherein the z-axis corresponds to a cable pass-through direction through the cable sealing interface, and wherein the first and second cable sealing bodies (34, 36) are each less deformable along the z-axis as compared to both the x and y axes; and characterized in that: the at least one reinforcing structure of each of the first and second cable sealing bodies (34, 36) is a three-dimensional block matrix that is embedded into the gel block (30, 32) of the first and second cable sealing bodies (34, 36), the three-dimensional block matrix providing a self-supporting shape of the at least one reinforcing structure and having inherent elastic characteristics configured to provide internal spring loading within the gel block (30, 32) during sealing.