The white paper entitled "Water-Blocked Cables" explains that in 1993, Optical Cable Corporation was the first company to manufacture a water-blocked tight-buffered fiber optic cable with no gel. The gel filling is very important to some loose-tube gel-filled fiber optic cable manufacturers due to the voids in and between the tubes and loose-jacketed cables, which would otherwise allow large volumes of water to flow into the cable without effective water-blocking. The 900 micron fiber buffer used in Optical Cable Corporation's tight-buffered fiber optic cables is a fully outdoor rated water tolerant material, so the fiber itself is better protected from potential exposure to water. Rather than attempting to be "waterproofed", water tolerant is clearly the design approach of choice.