page_title: Finnish–Estonian defence cooperation
section_title: Submarines
hierarchical_section_title: Finnish–Estonian defence cooperation / Submarines
caption_attribution_description: English: The Estonian submarine Kalev Suomi: Viron sukellusvene Kalev
context_page_description: Finnish–Estonian defence co-operation began in 1930 with a secret military pact between Finland and Estonia against the threat of the Soviet Union. Open co-operation ended in 1939, as the Soviets pressured the Estonian government, but it continued secretly with information-sharing during the Winter War.
context_section_description: The joint deployment of submarines was a part of the Gulf blockade plan. The Estonian submarine programme was expensive; the Estonian Navy even had to sell two destroyers in 1933 to be able to finance the two new submarines it launched in 1937. Estonian submarines installed the same kind of torpedoes and mines as their Finnish counterparts, and Estonian naval officers were trained in Finnish submarines.
caption: The Estonian submarines Kalev and Lembit were both manufactured in the United Kingdom and began their service in spring 1937.
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