Abstract: A high-strength, waterproof cable capable of transmitting large quantities of information over great distances in a reliable and durable fashion and a method of making the cable is provided. The cable includes a first central core portion having a pair of opposed ends, with each end having a locking surface. The cable further includes a second central core portion having a pair of opposed ends, each end having a locking surface. The second core portion is sealed to the first core portion by engagement of the respective locking surfaces. The sealed first and second core portions form a central core having a hollow interior chamber. A water-blocking material is located in the sealed chamber and an optical fiber array is located in the sealed chamber and embedded in the water-blocking material. A multiplicity of high tensile strength steel wires are helically wrapped around the core and a thermoplastic jacket is positioned outwardly of and surrounding the steel wires.