Italian submarine Pietro Calvi

History
Kingdom of Italy
Name	Pietro Calvi
Builder	Odero-Terni-Orlando, Muggiano, La Spezia
Laid down	1932
Launched	3 March 1935
Commissioned	1936
Fate	Sunk by HMS Lulworth, 15 July 1943
General characteristics
Class and type	Calvi-class submarine cruiser
Displacement	1,549 t (1,525 long tons) (surfaced) 2,061 t (2,028 long tons) (submerged)
Length	84.3 m (276 ft 7 in)
Beam	7.7 m (25 ft 3 in)
Draft	5.2 m (17 ft 1 in)
Installed power	4,400 bhp (3,300 kW) (diesels) 1,800 hp (1,300 kW) (electric motors)
Propulsion	2 shafts; diesel-electric 2 × diesel engines 2 × electric motors
Speed	16.8 knots (31.1 km/h; 19.3 mph) (surfaced) 7.4 knots (13.7 km/h; 8.5 mph) (submerged)
Range	11,400 nmi (21,100 km; 13,100 mi) at 8 knots (15 km/h; 9.2 mph) (surfaced) 120 nmi (220 km; 140 mi) at 3 knots (5.6 km/h; 3.5 mph) (submerged)
Test depth	90 m (300 ft)
Crew	77
Armament	8 × 533 mm (21 in) torpedo tubes (4 bow, 4 stern) 2 × single 120 mm (4.7 in) deck guns 2 × twin 13.2 mm (0.52 in) machine guns

Pietro Calvi was the lead ship of its class of two submarines built for the Regia Marina (Royal Italian Navy) during the 1930s. Completed in 1936, she played a minor role in the Spanish Civil War of 1936–1939 supporting the Spanish Nationalists. The submarine made multiple patrols in the Atlantic Ocean during the Second World War, sinking seven Allied ships. Pietro Calvi was rammed and sunk by a British convoy escort in July 1942.