In addition to the Blekinge-class boats that will eventually enter service by the end of the decade, Sweden currently has three Gotland-class submarines built between 1992 and 1997.
Each of the 1,246-ton submarines of the Sjöormen-class was powered by four 1,566 kW (2,100 shp) diesel engines and one electric motor driving a single shaft. The Hedemora Diesel generators provided a top speed of 20 knots submerged.
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