Method for production of a glass-fibre spool having a multilayer, self-supporting winding (12) of a glass fibre (13) for transmission of information which can be unwound from the winding interior, in which the glass fibre (13) is wound onto a winding former to form a winding (12), and the winding former is subsequently removed from the winding (13), characterized in that the winding (12) is wound in a crossed-over configuration and the glass fibre is itself rotated on each turn during the winding process, in that the winding (12), with the winding former left in it, is impregnated with an impregnation substance which is chemically inert, is resistant to seawater, is liquefied by heat and is based on hydrocarbon, in that a predetermined impregnation level of the winding (12) is set by dripping off a portion of the impregnation substance, and in that the winding (12) is cooled down to below its phase transition temperature with the winding former rotating and being aligned horizontally, and the winding former is removed from the cooled-down winding (12).