damage in 1918. Enough money was raised to allow the purchase of a new floating dock from the German company Flender, as Yavuz could not be towed anywhere without risk of her sinking in rough seas. The French company Atelier et Chantiers de St. Nazaire-Penhöet was contracted in December 1926 to oversee the subsequent refit, which was carried out by the Gölcük Naval Shipyard. Since the Treaty of Lausanne in 1923 required the disarmament of the Turkish Straits, the infrastructures belonging to the Turkish Naval Forces on the Bosphorus (in Istinye) and on the Golden Horn were transferred to Gölcük. In this period, Gölcük was designated as the main Turkish naval base. The overhaul works of TCG Yavuz proceeded over three years (1927–1930); they were delayed when several compartments of the dock collapsed while being pumped out. Yavuz was slightly damaged before she could be refloated and the dock had to be repaired before the overhaul works could be resumed. The Minister of the Navy, İhsan Eryavuz, was convicted of embezzlement in the resulting investigation which became known as the Yavuz-Havuz case (havuz meaning "dock" in Turkish naval engineering terminology.) The investigation revealed that Ihsan Eryavuz had reduced the insurance obligation of the French company (Atelier et Chantiers de St. Nazaire-Penhöet) from 5 million to 1.5 million Turkish liras, and was convicted guilty of fraud, which resulted in the abolition of the Ministry of the Navy on 27 December 1927. Undersecretariat of the Sea Following the dissolution of the Ministry of the Navy, the naval forces were reorganized under the Ministry of National Defense and on 16 January 1928 the Undersecretariat of the Sea (Deniz Müsteşarlığı) was established in order to undertake the duties of the former Ministry of the Navy. With this new reorganization, the Turkish Fleet Command was put under the command of the Turkish General Staff in terms of administration and logistics. On 2 November 1930, the Naval War College (Deniz Harp Akademisi) commenced training and education of Staff Officers at its facilities in the Yıldız Palace. During World War II, the naval schools were temporarily relocated from Istanbul to Mersin for security reasons and conducted education and training activities in this city. In 1933, with the approval of the Turkish Grand National Assembly, Gölcük was designated as the main base of the Turkish Navy. In the same year, the first new ship built at the Gölcük