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HMS Swordfish was an experimental submarine built for the Royal Navy before the First World War to meet the Navy's goal of an "overseas" submarine capable of 20 knots on the surface. Diesel engines of the period were unreliable and not very powerful so steam turbines were proposed instead to meet the RN's requirement. Swordfish proved to be slower than designed and unstable while surfacing, and consequently she was modified as an anti-submarine patrol vessel in 1917. She was paid off before the end of the war and sold for scrapping in 1922.
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