Method for manufacturing a submarine cable containing a number of conductors comprising power conductors and/or data conductors which are received within a cable protection tube of plastics material, the following steps being carried out: a) providing the conductors and the cable protection tube, and conveying into a common assembly region; b) gathering the conductors and the cable protection tube; c) opening a separation slot of the cable protection tube such that an introduction opening of the opened separation slot is formed; d) retaining the opened separation slot; e) introducing the conductors into the cable protection tube through the introduction opening of the opened separation slot; f) releasing the retention of the opened separation slot; - wherein closing of the opened separation slot takes place during or after step 1f); - wherein closing of the opened separation slot is performed by overlapping in an overlapping region of angular jacket strips of the cable protection tube on both sides of the separation slot, or by abutting two longitudinal edges of the separation slot, or by receiving in particular in a clamping manner a flexible closure tape between two longitudinal edges of the separation slot; and - wherein, in temporal terms before or during step 1e) or in temporal terms during or after step 1f) or in temporal terms between step 1e) and step 1f), a sealing watertight embedding layer or casting compound is filled into the intermediate space between the cable protection tube and the conductors located therein. a) providing the conductors and the cable protection tube, and conveying into a common assembly region; b) gathering the conductors and the cable protection tube; c) opening a separation slot of the cable protection tube such that an introduction opening of the opened separation slot is formed; d) retaining the opened separation slot; e) introducing the conductors into the cable protection tube through the introduction opening of the opened separation slot; f) releasing the retention of the opened separation slot; - wherein closing of the opened separation slot takes place during or after step 1f); - wherein closing of the opened separation slot is performed by overlapping in an overlapping region of angular jacket strips of the cable protection tube on both sides of the separation slot, or by abutting two longitudinal edges of the separation slot, or by receiving in particular in a clamping manner a flexible closure tape between two longitudinal edges of the separation slot; and - wherein, in temporal terms before or during step 1e) or in temporal terms during or after step 1f) or in temporal terms between step 1e) and step 1f), a sealing watertight embedding layer or casting compound is filled into the intermediate space between the cable protection tube and the conductors located therein. - wherein closing of the opened separation slot takes place during or after step 1f); - wherein closing of the opened separation slot is performed by overlapping in an overlapping region of angular jacket strips of the cable protection tube on both sides of the separation slot, or by abutting two longitudinal edges of the separation slot, or by receiving in particular in a clamping manner a flexible closure tape between two longitudinal edges of the separation slot; and - wherein, in temporal terms before or during step 1e) or in temporal terms during or after step 1f) or in temporal terms between step 1e) and step 1f), a sealing watertight embedding layer or casting compound is filled into the intermediate space between the cable protection tube and the conductors located therein.