Levi knew some German from reading German publications on chemistry; he worked to orient quickly to life in the camp without attracting the attention of the privileged inmates. He used bread to pay a more experienced Italian prisoner for German lessons and orientation in Auschwitz. He was given a smuggled soup ration each day by Lorenzo Perrone, an Italian civilian bricklayer working there as a forced labourer. Levi's professional qualifications were useful: in mid-November 1944, he secured a position as an assistant in IG Farben's Buna Werke laboratory that was intended to produce synthetic rubber. By avoiding hard labour in freezing outdoor temperatures he was able to survive; also, by stealing materials from the laboratory and trading them for extra food. Shortly before the camp was liberated by the Red Army, he fell ill with scarlet fever and was placed in the camp's sanatorium (camp hospital). On 18 January 1945, the SS hurriedly evacuated the camp as the Red Army approached, forcing all but the gravely ill on a long death march to a site further from the front, which resulted in the deaths of the vast majority of the remaining prisoners on the march. Levi's illness spared him this fate.