Levi's studies continued during the bombardments. The family suffered additional strain as his father became bedridden with bowel cancer. Chemistry Because of the new racial laws and the increasing intensity of prevalent fascism, Levi had difficulty finding a supervisor for his graduation thesis, which was on the subject of Walden inversion, a study of the asymmetry of the carbon atom. Eventually taken on by Dr. Nicolò Dallaporta, he graduated in mid-1941 with full marks and merit, having submitted additional theses on x-rays and electrostatic energy. His degree certificate bore the remark, "of Jewish race". The racial laws prevented Levi from finding a suitable permanent job after graduation. In December 1941 Levi received an informal job offer from an Italian officer to work as a chemist, under a clandestine identity, at an asbestos mine in San Vittore. The project was to extract nickel from the mine spoil, a challenge he accepted with pleasure. Levi later understood that, if successful, he would be aiding the German war effort, which was suffering nickel shortages in the production of armaments. The job required Levi to work under a false name with false papers. Three months later, in March 1942, his father died. Levi left the mine in June to work in Milan. Recruited through a fellow student at Turin University, working for the Swiss firm of A Wander Ltd on a project to extract an anti-diabetic from vegetable matter, he took the job in a Swiss company to escape the race laws. It soon became clear that the project had no chance of succeeding, but it was in no one's interest to say so. In July 1943, King Victor Emmanuel III deposed Mussolini and appointed a new government under Marshal Pietro Badoglio, prepared to sign the Armistice of Cassibile with the Allies. When the armistice was made public on 8 September, the Germans occupied northern and central Italy, liberated Mussolini from imprisonment and appointed him as head of the Italian Social Republic, a puppet state in German-occupied northern Italy. Levi returned to Turin to find his mother and sister in refuge in their holiday home 'La Saccarello' in the hills outside the city. The three embarked to Saint-Vincent in the Aosta Valley, where they could be hidden. Being pursued as Jews, many of whom had already been interned by the authorities, they moved up the hillside to Amay in the , a rebellious area