 Tegetthoff would remain in port for another three years . The most significant moments of her stay in Pola were two inspections by dignitaries , the first by the new Emperor Karl I on 15 December 1916 and the second by the German Kaiser Wilhelm II on 12 December 1917 . The second came during the Kaiser 's inspection of the port city 's German submarine base . While there the port of Pola and the vessels therein were subject to over eighty air raids by the newly formed Italian Air Force . 
