 The weight of early submarine cables using loading coils could cause excessive stress in the cable if not handled carefully.Additionally, Krarup cable has none of the problems of sealing the joins against seawater which was a major problem with loading coils before modern polymers began to be used.For these reasons, Krarup cable was popular on shorter distances, where the distortion was not so high that loading coils had to be used, until the advent of permalloy cable superseded it.