The submarine has a single-piece storage platform (6) arranged in a pressure body (2) and for supporting a device (8) e.g. drive motor and pump, that is elastically supported on rubber springs (10). The platform is formed from a composite material and plastics i.e. carbon- and glass fiber reinforced plastics. The platform comprises a planar base body reinforced by and integrated into carriers (20), where portions of the carriers projects at both flat sides of the base body. The base body is formed from a multi-axial core of a fiber composite material.
