The Sidi-Ferruch was a French Redoutable Class submarine of 1379 tons displacement launched in 1937. She was powered by diesel engines providing a top speed of 19 knots surfaced and electric motors providing a top speed of 10 knots submerged. She carried a complement of 67 and was armed with one 3.9 inch anti-aircraft gun; two machine guns and eleven 21.7 inch torpedo tubes. Research Sidi-Ferruch
 
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