the rough events of the February Revolution and the Civil War the museum continued to develop. In 1920, the work of Olbian expedition was organized because of the initiative of local government. So with the help of this the archaeological museum collection was enriched in 1634 items. From that time the museum itself became known as the historical and archaeological. Natural collection became a separate museum. After the death of S. I. Gaiduchenko, F. T. Kaminsky – archaeologist, expert on the history of the land, popularizer of the ancient monuments – became the director of the museum (May 1923). Feodosij Kaminsky cooperated with B. V. Farmakovskyi, the famous archaeologist, director of the Olbian expedition, B. V. Farmakovskyi. From 1925, he was taking part in the expedition and was involved in the creation of archaeological preserve "Olbia". All the materials from excavations were sent to the museum's collection. F. T. Kaminsky made an important contribution into conservation of other historical monuments of the region. Museum required a new space for the exposition, and F. T. Kaminsky started to look for the new place. In March 1929, the ceremonial opening of the new exposition of the museum took place on the Soviet Square. But six months later, the museum's director, tireless researcher F. T. Kaminsky, was accused for being a member of the Union for the Freedom of Ukraine process, and had been in Joseph Stalin's camps for 25 years. The terrible repressions didn't omit the other museum's staff. The prominent local historian and scholar M. D. Lahuta was also arrested. The museum's exhibition in 30-s has become very politicized. This event reduced the level of it perception. In 1936, because of the reconstruction of Soviet Square the museum moved to the building on the Dekabristiv Street, 32. In the early 1940s, the new departments opened in the museum: Olbia, feudalism, the history of Mykolaiv and the history of weapons, which exhibited the Turkish guns of the 17th century, guns of the period of the Russian-Turkish war of the 18th century. After the liberation of Mykolaiv, the museum's workers presented the new exposition and restored exhibits. The museum was required by the citizens who survived after a terrible war and did not lose interest to the history and nature of native land. In November 1950, the unification of historical and natural history museums into Mykolayiv Regional Museum of Local History took place.