Yugoslav submarine Osvetnik

The Yugoslav submarine Osvetnik was the first of the Osvetnik-class diesel-electric submarines built by Ateliers et Chantiers de la Loire, Nantes, France for the navy of the Kingdom of Serbs, Croats and Slovenes (later Yugoslavia). She was launched in 1929, and was built to a Simonot design similar to the French Circé-class.

During the German-led Axis invasion of Yugoslavia in April 1941, she was captured by Italian forces at the Bay of Kotor. She saw service with the Regia Marina as Francesco Rismondo. She was scuttled by the Germans shortly after her capture in September 1943 which followed the Italian surrender.

Description and construction
Osvetnik was built for the Kingdom of Serbs, Croats and Slovenes (later Yugoslavia) by the Ateliers et Chantiers de la Loire company at Nantes, France. Her design was based on a Simonot design, similar to the French Circé-class. Along with her sister ship of the Osvetnik-class Smeli, she had an overall length of 66.5 m, a beam of 5.4 m, and a surfaced draught of 3.8 m. Her surfaced displacement was 630 LT (809 LT submerged), and her crew consisted of 43 officers and enlisted men.

She had two shafts driven by two MAN diesel engines or two Nancy electric motors. The diesel engines were rated at 1480 bhp and the electric motors at 1000 shp, and she was designed to reach a top speed of 14.5 kn under diesel power and 9.2 kn on her electric motors. She was able to dive to a depth of 260 ft, and had a surface range of 3500 nmi at 9 kn, and 75 nmi at 5 kn submerged. She was armed with six 550 mm torpedo tubes (four bow-mounted, two stern-mounted), one 100 mm gun, and one 40 mm anti-aircraft gun.

Career and fate
Osvetnik was the first of her class, and the third submarine of the navy of the Kingdom of Serbs, Croats and Slovenes, which subsequently became the Royal Yugoslav Navy. During the German-led Axis invasion of Yugoslavia in April 1941, she was captured by Italian forces at the Bay of Kotor. She was commissioned by the Italians as Francesco Rismondo. On 14 September 1943 she was captured by the Germans at Bonifacio at the southern tip of the island of Corsica, and they scuttled her four days later.