Italian submarine Ondina

The Sirena class was an improved and enlarged version of the preceding {{sclass|Argonauta|submarine}}s. They displaced {{convert|680|LT|t|sp=us|lk=on|order=flip|0}} surfaced and {{convert|837|LT|t|sp=us|order=flip|0}} submerged. The submarines were {{convert|61.5|m|ftin|sp=us}} long, had a beam of {{convert|5.7|m|ftin|sp=us}} and a draft of {{convert|4.7|m|ftin|sp=us}}. Their crew numbered 45 officers and enlisted men.Chesneau, p. 309

For surface running, the boats were powered by two {{convert|675|bhp|lk=on|0|adj=on}} diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a {{convert|400|hp|0|adj=on}} electric motor. They could reach {{convert|14|kn|lk=in}} on the surface and {{convert|7.5|kn}} underwater. On the surface, the Sirena class had a range of {{convert|5000|nmi|lk=in}} at {{convert|8|kn}}; submerged, they had a range of {{convert|72|nmi|abbr=on}} at {{convert|4|kn}}.Bagnasco, p. 148

The boats were armed with six {{convert|53.3|cm|in|0|adj=on|sp=us}} torpedo tubes, four in the bow and two in the stern for which they carried a total of 12 torpedoes. They were also armed with a single Škoda 10 cm K10#OTO 100.2F47 History deck gun forward of the conning tower for combat on the surface. The anti-aircraft armament consisted of two or four Breda Model 1931 Machine Gun machine guns.

Ondina was laid down by Cantieri Riuniti dell'Adriatico at their Monfalcone shipyard in 1931, launched on 2 December 1933 and completed the following year.

File:Refah tragedy in Cumhuriyet.jpg on June 27, 1941]]

On 23 June 1941 Ondina under the command of Corrado Dal Pozzo at location indicated as (36.08N-34.44E) in Italian naval records. Ondina and Italian Naval records show the submarine fired a torpedo and sank the Turkish Transport vessel Refah of whom only 32 survived out of 200 on board.

Ondina was also sunk a year later by the warships HMSAS Protea, HMSAS Southern Maid (both Southern-class whalers) and Supermarine Walrus warplanes near Cyprus At (34-35 N, 34-56 E) on 11 July 1942. However, the command of Ondina was under Lieutenant Gabriele Adolfi at that time. The Italian sailors from Ondina were recovered by the warships. (5 killed/41 survived).[https://uboat.net/italian_submarines/boats/81 Italian Submarines]

{{reflist|30em}}

• {{cite book|last=Bagnasco |first=Erminio |title=Submarines of World War Two |year=1977 |publisher=Naval Institute Press |location=Annapolis, Maryland |isbn=0-87021-962-6}}
• {{cite book|last=Brescia|first=Maurizio|title=Mussolini's Navy: A Reference Guide to the Regina Marina 1930–45|year=2012|publisher=Naval Institute Press|location=Annapolis, Maryland|isbn=978-1-59114-544-8}}
• {{cite book|title=Conway's All the World's Fighting Ships 1922–1946|editor1-last=Chesneau|editor1-first=Roger|publisher=Conway Maritime Press|location=Greenwich, UK|year=1980|isbn=0-85177-146-7}}
• {{cite book|last=Rohwer|first=Jürgen|title=Chronology of the War at Sea 1939–1945: The Naval History of World War Two|publisher=Naval Institute Press|location=Annapolis, Maryland|year=2005|edition=Third Revised|isbn=1-59114-119-2|authorlink=Jürgen Rohwer}}

• [https://www.marina.difesa.it/noi-siamo-la-marina/mezzi/mezzi-storici/Pagine/sommergibili.aspx Sommergibili] Marina Militare website

{{Portal bar|Italy|Engineering}}

{{Sirena-class submarine}}

{{Italian 600 Series submarines}}

{{DEFAULTSORT:Ondina}}

Category:Sirena-class submarines

Category:World War II submarines of Italy

Category:1933 ships