The invention relates to a data cable. One embodiment of the data cable has at least one pair of wires and a cable sheath surrounding the at least one pair of wires. The at least one pair of wires has two wires twisted together in the longitudinal direction of the data cable. Cavities between the at least one pair of wires and the cable sheath are at least partially filled with a filler. The filler has a viscosity which is such that it adheres in the data cable in such a way as to remain in the data cable at least nearly completely when there is a specified pressure difference between one end of the data cable and the other end of the data cable.