A metallurgical vessel and method of making a wall of the vessel

A metallurgical vessel with a cavity to treat a first liquid metal or for the liquefaction of a metal cooled wall plates (1) facing with the cavity hot side and a cavity cold side facing away from a second metal comprises and (with optical waveguides 5, 6, 7) is provided for detecting data of the metallurgical vessel or the first metal, is characterized in that the optical waveguides (5, 6, 7) are arranged close to the surface in the area of ​​the hot side.