The Vetehinen Class was a class if submarines built in Finland in the late 20s, following German standards of the First World War. Due to poor operating conditions of the Baltic, they don't had many successes against the Russians, sinking a few ships. Indeed, in the Winter War, arrived to remove their guns, for use in fortifications. Undermined Russian ports of Estonia and, when it collaborated with the Soviets in 1939.
- Quantity completed: 3 (Vetehinen, Vesihiisi and Iku-Turso)
- Length: 63.5 m
- Beam (width): 6.2 m
- Silent: 3.6 m
- Displacement: 493 tons (surface) and 716 tons (submerged)
- Propulsion: 2-Atlas Polar diesel 6 cylinder (515 HP rpm580) (surface) and Brown-Boveri two electric motors (420 rpm 360 hp) (submerged) of
- Maximum speed: 12.6 knots (surface) and 8.5 knots (submerged)
- Autonomy: 2800 km at 10 knots (surface) and 140 km at 4 knots (submerged)
- Maximum depth: 75 m
- Armament Barrel: 1 Bofors 76 mm cannon 48 calibers, a 20 mm Madsen SEA is a .50 machine gun
- Torpedoes and mines: 4 tubes of 53 mm (two recharge) and 20 mines, 650 kg.
- Crew: 30-3 officers, five teachers, nine noncommissioned officers, 13 sailors
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