Quoted
...in Finnish territorial waters about 30-40 vessels operated each summer during the years 1919-1923. The Navy cleared 3 000 km2 and destroyed 1 000 mines. The Navy losses were sweepers T 5 in June 1919 and MP 1 on 5 July 1919. Four men were lost during the mine clearance, two men when MP 1 was lost. Two merchantmen were lost.
Quoted
During World War II the Gulf of Finland was the most heavily mined area. After the war, by the order of the victors, clearing of the mines was Finlands duty. After the Armistice in 1944 some of the most important sea lanes were sweeped. These were mainly routes that Soviets needed to attack Germany. During a 40 days period over 700 mines, drifting mines and anti-sweeping devices were destroyed. Three vessels were lost. Twelve men were lost and nine wounded. During the main cleaning operation in 1945-1950 over 35 000 km2 was sweeped. 9276 mines or anti-sweeping devices were destroyed, about 10% of these were drifting. 28 men were lost and 37 wounded. This sweeping force was second largest in the world with 2 000 men and 200 vessels. Only Japan had a larger force.
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