Sisu (1938 icebreaker)
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Sisu was a Finnish state-owned icebreaker. Built in 1939 at Wärtsilä Hietalahti Shipyard in Helsinki, she was one of the world's first diesel-electric icebreakers. In addition to icebreaking duties, s
Sisu together with two Finnish submarines
Voima (1924 icebreaker)
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Voima was a Finnish and later Soviet steam-powered icebreaker. Laid down at Werft Becker & Co. in Tallinn in 1916 and fitted with engines in Danzig in 1918, the unfinished icebreaker was towed to Hels
Voima was fitted with 120 mm Pattern 1905 deck guns before the Second World War