Sidensner Karl Karlovich 
(03.05.1809–18.03.1889)

Russian military sailor, admiral. 
Descended from the nobility of the Grand Duchy of Finland. 
In 1825, Sidensner entered the Naval Cadet Corps as a midshipman, sailed across the Baltic Sea every year. 
After production in 1828, the midshipmen served on the Mediterranean, where he participated in the blockade of the Dardanelles and other hostilities. After returning to Kronstadt in 1832, Sidensner commanded a custom yacht for a year, and from 1833 began his long, very important and fruitful service on the inventory of Finnish skerries, to which he introduced many original techniques that were later used by other hydrographs for many years. The most important of them - measured by the method of squares. 
Since 1853, Sidensner’s team and organizational activities began. He was appointed a member of the shipbuilding scientific committee in St. Petersburg, served in responsible positions under the Finnish governor-general, distinguished himself during the bombardment by the Anglo-French fleet of the fortress of Sveaborg and Helsingfors. In subsequent years, Sidensner commanded an engineering and artillery school, was a member of the academic council of the academic course in marine sciences, and also a member of the academic department of the Marine Technical Committee. In 1879, with the rank of vice-admiral, he retired. 
Sidensner's merits are awarded with the orders of St. Stanislav 2 degrees with swords, St. Vladimir 3 and 4 degrees, St. Anna 1 degree. 
He died in St. Petersburg, was buried in Vyborg at the Orthodox cemetery. 
Cape on the western coast of the northern island of Novaya Zemlya, bordering the entrance to the North Sulmenev Bay from the north. Named by S.A. Moiseev in 1839.