The Spica class was a class of torpedo boats of the Regia Marina during World War II. These ships were built as a result of a clause in the Washington Naval Treaty, which stated that ships with a tonnage of less than 600 could be built in unlimited numbers. Thirty-two ships were built between 1934 and 1937, thirty of which entered service with Italy and two of which were sold to the Swedish Navy in 1940. The two units in Swedish service were classified as destroyers until 1953, then re-classified as corvettes. Although commonly referred to as torpedo boats due to their smaller displacement, the Spica class armament was similar to destroyers and were intended for anti-submarine operations but had to fight aircraft and surface forces. Twenty-three vessels were lost during the war.
Stabilimento Tecnico Triestino (STT) ("Technical Establishment of Trieste") was a private shipbuilding company based in Trieste from the mid-19th to early 20th century, and the most important naval shipbuilding firm of the Austro-Hungarian Empire.
The Ariete-class torpedo boats were a group of destroyer escorts built for the Italian Navy during World War II. They were enlarged versions of the Spica-class torpedo boats and designed to escort convoys to North Africa. Of the 42 units planned, sixteen ships were eventually ordered but only one was completed by the time of the armistice, Ariete, built in the Sestri Ponente shipyards and commissioned on 5 August 1943. The namesake ship was also the only one to survive the war. After the war it was ceded to the Yugoslav Navy (1949), and renamed Durmitor.
Cantieri Riuniti dell'Adriatico was an Italian manufacturer in the sea and air industry which was active from 1930 to 1966. This shipyard is now owned by Fincantieri.
The Hurja-class motor torpedo boats or H class was an Italian-designed class of Finnish motor torpedo boats, seeing service with the Finnish Navy during World War II. The five boats of the H class were built by Cantieri Baglietto in Genoa, Italy. The ships were converted into patrol boats in 1949, in accordance with the Paris peace treaty and their torpedo armament, forbidden by the treaty, was removed. The H class were stricken from the naval vessel register in 1963.
Ramb IV was an Italian hospital ship, built at Monfalcone by the United Yards of the Adriatic in 1938.
Delfino was one of four Squalo-class submarines built for the Regia Marina during the late 1920s. The boat served in World War II and was sunk in 1943 after a collision with another Italian ship.
The Squalo-class submarines were a group of four submarines built for the Royal Italian Navy during the 1930s. They were built at the Cantieri Riuniti dell'Adriatico (CRDA) shipyard at Monfalcone, and designed by Curio Bernardis.
Sava was a Flutto-class submarine in service with the Yugoslav Navy. Built by Cantieri Riuniti dell'Adriatico in Monfalcone during the Second World War, Sava was laid down and completed as Nautilo for service with the Italian Regia Marina.
The Motosilurante CRDA 60 t was a type of motor torpedo boat built for the Regia Marina during World War II. It was designed on the pattern of German S-boats — some early examples of which were captured by the Italians from Yugoslav Navy — to complement the faster but less seaworthy MAS boats.
Uragano was a Ciclone-class torpedo boat that served with the Italian Navy during the Second World War. The vessel entered service in 1942 and was sunk by a naval mine on 3 February 1943.
Argo was the lead ship of her class of two submarines ordered by the Portuguese government, but taken over and completed for the Regia Marina during the 1930s.
Anfitrite was one of a dozen Sirena-class submarines, the second sub-class of the 600 Series of coastal submarines built for the Regia Marina during the early 1930s.
Naiade was one of a dozen Sirena-class submarines, the second sub-class of the 600 Series of coastal submarines built for the Regia Marina during the early 1930s.
Nereide was one of a dozen Sirena-class submarines, the second sub-class of the 600 Series of coastal submarines built for the Regia Marina during the early 1930s.
Sirena was one of a dozen Sirena-class submarines, the second sub-class of the 600 Series of coastal submarines built for the Regia Marina during the early 1930s.
Narvalo was one of four Squalo-class submarines built for the Regia Marina during the late 1920s. The boat served in World War II and was sunk in 1943 by British destroyers and aircraft.
Squalo was the lead ship of her class of four submarines built for the Regia Marina during the late 1920s. The boat served in World War II and was decommissioned in 1948.
Tricheco was one of four Squalo-class submarines built for the Regia Marina during the late 1920s. The boat served in World War II and was sunk in 1942 by the British submarine HMS Upholder.
The German torpedo boat TA37 was an Ariete-class torpedo boat operated by the German Kriegsmarine during the Second World War. The ship was built for the Italian Navy by the shipbuilder CRDA at their Trieste shipyard with the name Gladio in 1943, but was incomplete when Italy surrendered to the Allies in September 1943, and was seized by Nazi Germany. The ship entered service as TA37 in 1944, serving in the Adriatic and Aegean seas and was sunk by British destroyers on 7 October 1944.
Royal Thai Navy