The invention relates to a method for manufacturing an underwater cable (101), in particular a trailing cable for a trailing antenna of a watercraft, wherein the underwater cable (101) has a cable core (110) and an outer sheath (108, 109), and at least the cable core (110) is manufactured under a pressure which deviates from ambient pressure such that the cable core (110) is manufactured free of air bubbles, and the underwater cable, which has been brought to a depth under water and subsequently brought back to the surface of the water, has at most a change in density of ± 5.0%, in particular ± 3.0% or ± 1.5%. The invention additionally relates to an underwater cable, a submarine cable, a towed array sonar, and a vehicle.