|Kingdom of Italy|
|Builder||Cantieri Riuniti dell'Adriatico, Monfalcone|
|Launched||27 November 1936|
|Fate||Scuttled, 11 September 1943, when the Germans captured the Monfalcone shipyard, but then refloated. Finally scuttled by the Germans on 1 May 1945|
|Class and type||Argo-class submarine|
|Length||63.15 m (207 ft 2 in)|
|Beam||6.93 m (22 ft 9 in)|
|Draft||4.46 m (14 ft 8 in)|
|Test depth||90 m (300 ft)|
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 (Royal Italian Navy) during the 1930s.
The Argo-class submarines displaced 793 metric tons (780 long tons) surfaced and 1,016 metric tons (1,000 long tons) submerged. The submarines were 63.15 meters (207 ft 2 in) long, had a beam of 6.93 meters (22 ft 9 in) and a draft of 4.46 meters (14 ft 8 in). They had an operational diving depth of 90 meters (300 ft). Their crew numbered 46 officers and enlisted men.
For surface running, the boats were powered by two 750-brake-horsepower (559 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 400-horsepower (298 kW) electric motor. They could reach 14 knots (26 km/h; 16 mph) on the surface and 8 knots (15 km/h; 9.2 mph) underwater. On the surface, the Argo class had a range of 10,176 nautical miles (18,846 km; 11,710 mi) at 8 knots (15 km/h; 9.2 mph); submerged, they had a range of 100 nmi (190 km; 120 mi) at 3 knots (5.6 km/h; 3.5 mph).
The boats were armed with six internal 53.3-centimeter (21 in) torpedo tubes, four in the bow and two in the stern for which they carried a total of 10 torpedoes. They were also armed with a single 100-millimeter (3.9 in) deck gun, forward of the conning tower, for combat on the surface. The light anti-aircraft armament consisted of four single 13.2-millimeter (0.52 in) machine guns.
Argo was built by Cantieri Riuniti dell'Adriatico in its Monfalcone shipyard. The submarine had initially been ordered in 1931, but was acquired by the Italians when Portugal cancelled the order. She was launched in 1936, and saw action in the Second World War.
|1 December 1940||HMCS Saguenay||Royal Canadian Navy||1,358||Damaged|
|5 December 1940||Silverpine||United Kingdom||5,066||Sunk|