The Calvi class was a class of three submarines built by Oderno-Terni-Orlando in Genoa for the Royal Italian Navy (Italian: Regia Marina). The submarines were built in 1935, and all three served in the Mediterranean at the start of the Second World War. The boats were transferred to the BETASOM Atlantic submarine base at Bordeaux in August 1940. In December 1941 the boats were used for a rescue mission of 254 sailors from the sunken German auxiliary cruiserAtlantis. After Calvi had been sunk, Finzi and Tazzoli were selected for conversion to "transport submarines" in order to exchange rare or irreplaceable trade goods with Japan. Cargo capacity of 160 tons reduced reserve buoyancy from 20–25% to 3.5–6%; and armament was reduced to defensive machine guns.[1]
The Calvi class was an improved and enlarged version of the preceding Balilla-classsubmarine cruisers. They displaced1,549 metric tons (1,525 long tons) surfaced and 2,061 metric tons (2,028 long tons) submerged. The submarines were 84.3 meters (276ft 7in) long, had a beam of 7.7 meters (25ft 3in) and a draft of 5.2 meters (17ft 1in).[2] They had an operational diving depth of 90 meters (300ft).[3] Their crew numbered 77 officers and enlisted men.[2]
For surface running, the boats were powered by two 2,200-brake-horsepower (1,641kW)diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 900-horsepower (671kW)electric motor. They could reach 16.8 knots (31.1km/h; 19.3mph) on the surface and 7.4 knots (13.7km/h; 8.5mph) underwater. On the surface, the Calvi class had a range of 11,400 nautical miles (21,100km; 13,100mi) at 8 knots (15km/h; 9.2mph); submerged, they had a range of 120nmi (220km; 140mi) at 3 knots (5.6km/h; 3.5mph).[3]
The first patrol during the Second World War was from Liguria to the Atlantic Ocean, and lasted from 3 July to 6 August 1940. After overhaul at La Spezia, Calvi sailed on 6 October 1940 for a second Atlantic patrol, reaching Bordeaux on 23 October. Calvi suffered storm damage during its third patrol off the British Isles from 3 to 31 December 1940. The fourth patrol was between the Canary Islands and the Azores from 31 March to 13 May 1941. Calvi sailed on 1 August 1941 for a fifth patrol off the Canary Islands. During the sixth patrol from 7 to 29 December 1941 Calvi, Finzi and Tazzoli rescued sailors of the sunken raider Atlantis. The seventh patrol was off Brazil from 7 March to 29 April 1942. Calvi sailed on 2 July 1942 for its eighth patrol.[5]Calvi was rammed and sunk on 14 July 1942 by convoy SL 115 escort HMSLulworth.[6] Three officers and 32 sailors survived.[5]
Giuseppe Finzi (pennant number FZ) was launched 29 June 1935.[2] The first war patrol was from Cagliari to the Atlantic, and lasted from 5 June to 10 July 1940. The submarine sailed on 7 September 1940 and passed the Strait of Gibraltar on 13 September for an Atlantic patrol to Bordeaux, France, on 29 September. Admiral Karl Dönitz visited Giuseppe Finzi on 30 September to welcome Regia Marina sailors to the German base. The third patrol near the British Isles from 24 October to 4 December 1940 revealed that the diesel engine air intake was too exposed for North Atlantic winter weather. The fourth patrol was near the Canary Islands from 10 March to 17 April 1941 and the fifth patrol was off Gibraltar in August. During the sixth patrol from 7 to 29 December 1941 Pietro Calvi, Giuseppe Finzi and Enrico Tazzoli rescued sailors of the sunken German commerce raiderAtlantis. The submarine sailed for Operation Neuland on 6 February 1942 and returned on 31 March. She returned to the Caribbean Sea for an eighth patrol from 6 June to 18 August 1942. On 26 November 1942 Giuseppe Finzi sailed for a ninth patrol to Brazil; but mechanical problems required return to base on 10 December. The boat patrolled the West African coast from 11 February to 18 April 1943. Conversion to a transport submarine was never completed, and the boat was seized by the Germans on 9 September 1943 when Italy surrendered to the Allies. Renamed UIT21 in German service, she was scuttled at Le Verdon-sur-Mer on 25 August 1944 to prevent her capture by the advancing Allied forces.[7][8]
Enrico Tazzoli (pennant number TZ) was launched 14 October 1935.[2] It was named after Enrico Tazzoli, a martyr of the Italian wars of independence. The first wartime patrol was off the coast of North Africa from 21 June to 2 July 1940. The second was an unsuccessful attempt to pass the Strait of Gibraltar from 30 July to 9 August 1940. After overhaul at La Spezia, Enrico Tazzoli sailed on 2 October 1940 and passed the Strait of Gibraltar on 7 October for an Atlantic patrol to Bordeaux on 24 October. The fourth patrol was off the British Isles from 13 December 1940 to 6 January 1941. The boat sailed on 7 April 1941 to patrol between Freetown and the Azores; and shot down an attacking Bristol Blenheim while returning to port on 23 May. The sixth patrol was again off Freetown from 15 July to 11 September 1941. During the seventh patrol from 7 to 27 December 1941 Pietro Calvi, Giuseppe Finzi and Tazzoli rescued sailors of the sunken German commerce raiderAtlantis. The submarine sailed for Operation Neuland on 2 February 1942 and returned on 31 March. The ninth patrol was again to the Caribbean from 18 June to 5 September 1942; and the tenth patrol was to Brazil from 14 November 1942 to 2 February 1943.[9] After conversion to a transport submarine for blockade-running between Europe and the Far East, Enrico Tazzoli sailed for Japan on 16 May 1943 and was sunk by aircraft in the Bay of Biscay on 23 May.[10]
Bagnasco, Erminio (1977). Submarines of World War Two. London: Cassell. ISBN1-85409-532-3.
Blair, Clay (1996). Hitler's U-Boat War, The Hunters 1939–1942. Random House. ISBN0-394-58839-8.
Brescia, Maurizio (2012). Mussolini's Navy: A Reference Guide to the Regina Marina 1930–45. Annapolis, Maryland: Naval Institute Press. ISBN978-1-59114-544-8.
Brice, Martin (1981). Axis Blockade Runners of World War II. Naval Institute Press. ISBN0-87021-908-1.
Campbell, John (1985). Naval Weapons of World War Two. Annapolis, Maryland: Naval Institute Press. ISBN0-87021-459-4.
Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. London: Conway Maritime Press. ISBN0-85177-146-7.
Frank, Willard C. Jr. (1989). "Question 12/88". Warship International. XXVI (1): 95–97. ISSN0043-0374.
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Regia Marina 
