During the series of Russo-Turkish Wars, (1710–1711, 1735–1739, 1768–1774, 1787–1792, 1806–1812, 1828–1829), the fleet sailed into the Mediterranean Sea on the First and Second Archipelago Expeditions and destroyed the Ottoman Imperial Navy at the sea Battles of Chesma (1770), the Dardanelles (1807), Athos (1807), and Navarino (1827). At about the same time, Russian Admiral Ivan Krusenstern circumnavigated the globe, while another Baltic Fleet officer – Fabian Gottlieb von Bellingshausen – discovered the southern ice-covered continent, Antarctica.