Tank and method

A tank for storage of liquid or gaseous substances, with a fiber-reinforced plastic sheathing, which limits at least one interior space for an accommodation of materials to be stored, wherein at least one circumferential section of the fiber-reinforced-plastic sheathing has an evacuable sandwich structure which completely encloses the circumferential section,

• wherein the at least one circumferential section is a center circumferential section, to which a respective one of two end-side circumferential sections adjoins on both sides, which is respectively covered with a respective one of two evacuable external structures,
• wherein the interior space is divided by means of an evacuable separation bulkhead for creation of a first and a second chamber, and
• wherein the evacuable sandwich structure of the center circumferential section, the evacuable external structures of the two end-side circumferential sections and the evacuable separation bulkhead are connected to each other via aligning holes or ducts, and to at least one connection line for evacuation.