Otraria was one of two s ordered by the Portuguese government, but taken over and completed for the (Royal Italian Navy) during the 1930s. She played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists.
Design and description The Glauco-class submarines were improved versions of the preceding . They displaced surfaced and submerged. The submarines were long, had a beam of and a draft of . They had an operational diving depth of . Their crew numbered 58 officers and enlisted men.Chesneau, p. 305
For surface running, the boats were powered by two diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. They could reach on the surface and underwater. On the surface, the Glauco class had a range of at ; submerged, they had a range of at .Bagnasco, p. 150
The boats were armed with eight internal torpedo tubes, four each in the bow and stern for which they carried a total of 14 torpedoes. They were also armed with two deck guns, one each fore and aft of the conning tower, for combat on the surface. Their anti-aircraft armament consisted of one or two machine guns.
Construction and career Otraria was laid down by CRDA in its Trieste shipyard. The submarine had initially been ordered in 1931, but was acquired by the Italians when Portugal cancelled the order. She was launched on 20 March 1935 and entered service in January 1936. During the Spanish Civil War she attempted to torpedo a Republican destroyer in Cartagena, but missed with the torpedo detonating against a mole.Frank, p. 95 Otraria survived the Second World War and was discarded on 1 February 1948.
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References
External links Otaria (1935) Marina Militare website