Italian submarines in World War Two

Italian Commanders

Antonio Dotta

Born  11 Aug 1904Fossano (Cuneo)


  T.V.Tenente di Vascello
  C.C.Capitano di Corvetta


9 Dec 1941 Medaglia d'argento al valore militare
12 Jan 1942 Medaglia d'argento al valore militare
24 Mar 1942 Medaglia di bronzo al valore militare
7 Apr 1946 Croce di guerra al valore militare
12 Apr 1946 Medaglia di bronzo al valore militare

Career information

From 20.04.1937, served as Second in Command to C.F. Primo Longobardo in 3° Gruppo (Messina).
SERPENTE (T.V. C.O.): from 28.10.1940 to 01.02.1941.
DIASPRO (T.V. C.O.): from 13.02.1941 to 22.11.1942.
Promoted to C.C. in July 1941).
GIOVANNI BAUSAN (C.C. C.O.): from 13.02.1942 to 26.03.1942.
SERPENTE (C.C. C.O.): from 01.12.1942 to 04.03.1943.
RUGGIERO SETTIMO (C.C. C.O.): from 05.03.1943 to 31.12.1943.
MARCANTONIO BRAGADINO (C.C. C.O.): from 22.03.1944 to end of war.

Commands listed for Antonio Dotta

Submarine Type Rank From To
Serpente (ex-Nautilus) (SE)Coastal / Sea goingT.V.28 Oct 19401 Feb 1941
Giovanni Bausan (BN)Ocean goingC.C.13 Feb 194226 Mar 1942
Diaspro (DS)Coastal / Sea goingT.V.13 Feb 194130 Nov 1942
Serpente (ex-Nautilus) (SE)Coastal / Sea goingC.C.1 Dec 19424 Mar 1943
Ruggiero Settimo (RS)Ocean goingC.C.5 Mar 194331 Dec 1943
Marcantonio Bragadino (BG)MinelayingC.C.22 Mar 1944Aug 1945

Ships hit by Antonio Dotta

No ships hit by this Commander.

War patrols listed for Antonio Dotta

 SubmarineDateTimePortArr. dateArr. timeArr. portMilesDescription
Serpente (ex-Nautilus) (SE)5 Nov 19400835Taranto5 Nov 19401705Taranto35Exercises.

Serpente (ex-Nautilus) (SE)9 Nov 19400835Taranto9 Nov 19401710Taranto31Exercises.

Serpente (ex-Nautilus) (SE)11 Nov 19400805Taranto11 Nov 19401350Taranto21,2Exercises.

Serpente (ex-Nautilus) (SE)18 Nov 19400820Taranto18 Nov 19401540Taranto40Exercises.

Serpente (ex-Nautilus) (SE)19 Nov 19401010Taranto19 Nov 19401210Taranto1Exercises.

Serpente (ex-Nautilus) (SE)29 Nov 19400655Taranto29 Nov 19401530Taranto47Exercises.

Serpente (ex-Nautilus) (SE)30 Nov 19401155Taranto1 Dec 19401755Augusta301Passage Taranto-Augusta.

1.Serpente (ex-Nautilus) (SE)18 Dec 19401445Augusta25 Dec 19401135Augusta674,4Patrolled east of Malta from 35°30'N, 16°20'E on meridian to 10 miles south, on a patrol line with Dessié.
  20 Dec 1940010235° 30'N, 16° 20'EAt 0100 hours, a large enemy formation was sighted at 4-5,000 metres in very rough seas (Grecale wind). It was estimated to be three cruisers and a destroyer. The range was closing.

At 0102 hours, Serpente fired two torpedoes (533mm) from bow tubes at a distance of 2,500-3,000 metres, aimed at a cruiser and possibly a TRIBAL class destroyer. The submarine dived immediately after. She had reached a depth of 35 metres when a loud explosion was heard, indicating at least one hit and perhaps two.

This was almost certainly HMS Calcutta, three sloops and one destroyer who were about 80 miles east of Malta at the time but did not observe any attack.

It has sometimes been reported that the destroyer Hyperion was sunk in this attack, but this is an error: Hyperion was reported damaged by a mine at 0157 hours on 22nd December 1940 (24 miles east of Cape Bon or in 37°04' N, 11°30' E) and finally sunk at 0500 hours on the 22nd by HMS Janus.
  22 Dec 1940010235° 30'N, 16° 20'E
(0) Approximately.
At 0102 hours, two warships believed to be submarine chasers were sighted. Serpente dived and took evasive action, but apparently was undetected and surfaced three hours later.

Serpente (ex-Nautilus) (SE)29 Dec 19400845Augusta29 Dec 19401050Augusta3,9Exercises.

2.Serpente (ex-Nautilus) (SE)14 Jan 19411715Augusta28 Jan 19411030Augusta1419,7Patrolled north of Cyrenaica, from 33°10'N, 22°10'E on course 108° for 205 miles then 060° for 40 miles then 35°40'N, 20°40'E. Encountered rough weather but uneventful, except for hearing distant explosions.

Serpente (ex-Nautilus) (SE)29 Jan 19410945Augusta29 Jan 19411200Augusta3,4Trials.

Diaspro (DS)14 Feb 19410829Cagliari14 Feb 19411215Cagliari28,5Exercises.

Diaspro (DS)6 Mar 19410010Cagliari7 Mar 19410830Naples271Passage Cagliari-Naples.

Diaspro (DS)18 Apr 19410911Naples18 Apr 19411841Naples52Exercises.

Diaspro (DS)21 Apr 19410825Naples21 Apr 19411148Naples35Exercises.

Diaspro (DS)23 Apr 19410800Naples23 Apr 19411811Naples46Exercises.

Diaspro (DS)28 Apr 19410948Naples28 Apr 19411705Naples39Exercises.

Diaspro (DS)30 Apr 19410835Naples30 Apr 19411255Naples29Exercises.

Diaspro (DS)2 May 19410837Naples2 May 19411407Naples26Exercises.

Diaspro (DS)6 May 19411940Naples7 May 19410050Naples30Exercises.

Diaspro (DS)12 May 19410810Naples13 May 19411810Cagliari300Passage Naples-Cagliari.

3.Diaspro (DS)21 May 19410440Cagliari23 May 19411120Cagliari314Patrolled east of La Galite in 37°40'N, 09°50'E, with Corallo in an adjacent area, to intercept Force H reported to have sailed from Gibraltar. Uneventful. Sighted only an aircraft and heard H.E.

4.Diaspro (DS)5 Jun 19412315Cagliari12 Jun 19411150Cagliari824,5Patrolled in Western Mediterranean from 37°54'N, 08°00'E on course 265° to 06°00' then (between Sardinia and Bone) against an expected convoy from Gibraltar. Uneventful.

5.Diaspro (DS)2 Jul 19412119Cagliari12 Jul 19411200Cagliari991,5Patrolled in Western Mediterranean within 20 miles from 37°20'N, 02°40'E, with Corallo in an adjacent area, against an expected force from Gibraltar Uneventful.

6.Diaspro (DS)16 Jul 19411725Cagliari19 Jul 19410805Cagliari429,5Patrolled in Western Mediterranean on parallel between 37°30'N and 37°40'N, 06°00'E to 05°00'E, with Alagi in an adjacent area, against an expected force from Gibraltar. Uneventful.

7.Diaspro (DS)21 Jul 19411458Cagliari24 Jul 19410745Cagliari352Patrolled off Cape Bougaroni, on parallel from 37°30'N, 06°00'E to 05°00'E, with Alagi in an adjacent area. All torpedoes expended.
  22 Jul 19412307
2310 (e)
38° 10'N, 5° 30'EAt 1005 hours, as Cape Bougaroni was in sight, information was received that, at 0850 hours, an aircraft had spotted a large naval force in 38°26' N, 03°25' E.

At 1130 hours, a signal from MARICOSOM revealed that a force of one battleship, one aircraft carrier and four destroyers had been sighted at 0920 hours in 38°26' N, 03°35' E, steering 090° at 18 knots. T.V. Antonio Dotta estimated that this force could be 45 miles north of his position, at 1630 hours. He immediately altered course, expecting to reach the interception course at 1600 hours.

At 1440 hours, as Diaspro was proceeding northward, an order from MARICOSOM gave her freedom of action to move outside her patrol area to intercept the enemy.

At 1920 hours, a new signal from MARICOSOM reported the enemy's position at 1545 hours as 75 miles north of Cape Bougaroni, steering 090° at 20 knots. It was now described as one battleship, one aircraft carrier and seven destroyers. However, this position was only 7 miles from Diaspro at 1545 hours and, since no hydrophone noises had been picked up, Dotta estimated that the position provided by MARICOSOM was erroneous. At 1950 hours, bomb explosions could be heard to the west.

At 2015 hours, Diaspro was informed by MARICOSOM that an enemy naval force had been reported at 1505 hours, 75 miles north of Cape Sigli, consisting of a battleship, an aircraft carrier, four cruisers and five destroyers. It was not clear if this was the same force or a different one. At 2200 hours, the submarine submerged briefly to listen with the hydrophones and detected numerous noises westward. All forward tubes were readied as Corallo proceeded on the surface.

At 2258 hours, shadows were sighted and, two minutes later, the diesels were stopped and the electric motors switched on for a silent approach.

At 2304 hours, a naval force of eight to ten ships was sighted in the process of reverting course from 090° to 270°. It could now be identified as one or two destroyers leading the formation, followed by four cruisers, other destroyers, a battleship, an aircraft carrier and one or two destroyers bringing up the rear. The speed was estimated at 10 knots and distances varied from 1,000 to 1,300 metres.

At 2307 hours, a full salvo of four torpedoes was fired from the bow tubes aimed at the cruisers. They missed. T.V. Dotta believed that the very visible phosphorescence of the torpedo tracks had enabled the enemy to take avoiding action.

At 2309 hours, Diaspro had reverted course to fire two stern torpedoes aimed at the battleship and aircraft carrier from 700 metres and then crash-dived. Two explosions were heard about a minute after firing leading Dotta to believe that he had scored one or perhaps both the major units.

This was Force H covering the SUBSTANCE convoy, with the battle cruiser HMS Renown, the battleship HMS Nelson, the light cruiser HMS Hermione, the aircraft carrier HMS Ark Royal and screened by destroyers. One of these destroyers, HMAS Nestor, stationed on the starboard wing, reported two torpedoes, which were avoided. Just prior to this, two explosions had been heard which were probably torpedoes from Diaspro's first salvo, either detonating prematurely or hitting the sea bed. The destroyer now obtained an ASDIC contact at 1,700 yards and dropped a pattern of five depth charges set at medium depth, which exploded as the submarine had reached a depth of 40 metres. Another pattern of six depth charges was dropped on a second run and the same number on a third run. Nothing was seen, but there was a strong smell of oil.

In the submarine, about thirty depth charges were heard from 2312 to 0050 hours on 23rd July. Although, the first pattern was close, the remainder were not and the submarine was only slightly damaged. Diaspro had dropped to a depth of 138 metres before stabilising at 116 metres.

At 0330 hours, she made an enemy report and at 0557 hours sighted a squadron of destroyers apparently hunting her. Diaspro dived and proceeded to Cagliari. This is one of the rare instances, when an Italian submarine returned from a patrol in the Mediterranean having expended all her torpedoes.

8.Diaspro (DS)30 Jul 19412025Cagliari6 Aug 19410650Cagliari432Patrolled off Cape Bougaroni on 6° E meridian. At 1335 hours on 3rd August, Diaspro was informed of a convoy of eight ships in 37°20'N, 10°45'E, on course 270°, 10 knots and moved westward with the intention to carry out a night attack. Sighted only French ships.

Diaspro (DS)15 Aug 19410815Cagliari15 Aug 19411320CagliariExercises, escorted by the minesweeper Balear.

Diaspro (DS)22 Aug 19410858Cagliari22 Aug 19411335Cagliari22,5Exercises.

Diaspro (DS)23 Aug 19411320Cagliari23 Aug 19411816Cagliari27Exercises.

9.Diaspro (DS)24 Aug 19412200Cagliari27 Aug 19411410Cagliari307Patrolled west of La Galite within 10 miles from 37°30'N, 07°40'E.
  25 Aug 1941091037° 48'N, 8° 00'EAt 0010 hours, a submarine believed to be Aradam, was sighted. As a precaution, Diaspro proceeded submerged to her patrol area, which was 25 miles away at the time and again sighted the submarine at 1013 hours.

10.Diaspro (DS)12 Sep 19411355Cagliari15 Sep 19411050Cagliari359Patrolled east of La Galite between 37°32'N and North African coast, 08°56'E and 09°20'E.
  12 Sep 19411855
1852 (e)
38° 42'N, 9° 30'EAt 1855 hours, Diaspro was mistaken for an enemy submarine and attacked by Cant Z.506 no. 3 of 188^ Squadriglia based at Elmas. The aircraft dropped two bombs set to explode at a depth of 15 meters. The submarine was shaken, but escaped by diving to 70 meters. The aircraft observer G.M. Paolo Tavolato was reprimanded.

11.Diaspro (DS)16 Sep 19412355Cagliari17 Sep 19412145Cagliari184Sailed for patrol off SE of Minorca to form a patrol line with Serpente but then recalled. Uneventful.
  17 Sep 19411240At 1240 hours, the submarine Serpente was sighted at a distance 8,000 metres on opposite course. Diaspro had received the recall order but Serpente had not yet.

12.Diaspro (DS)25 Sep 19411835Cagliari2 Oct 19411100Cagliari814Sailed with Axum, Aradam and Serpente for patrol between 39°10'N and 39°50'N, and between 06°40'E and 07°00'E on a patrol line with them. On 27th September, was moved 100 miles south (in 38°25'N then moved to 37°30'N, 07°00'E on 28th September) then off Cape Bougaroni.
  29 Sep 19410617
0612 (e)
37° 32'N, 6° 45'EAt 0617 hours, in dense rain showers, a destroyer was suddenly sighted at a distance of 250 metres. Almost at the same another large shadow appeared at 2,500-3,000 metres. Diaspro fired her two stern tubes and crash-dived. After 3 minutes a loud explosion was heard as the submarine was at a depth of 30 metres.

This was the destroyer HMS Gurkha, on the port side of the screen of HMS Ark Royal, HMS Prince of Wales and HMS Rodney, covering the HALBERD convoy. The destroyer sighted the torpedo wakes and managed to avoid them. At 0622 hours, she heard two explosions, which were probably the torpedoes reaching the end of their run. The Dutch destroyer HrMs Isaac Sweers joined the hunt, but did not drop any depth-charges. HMS Gurkha got a contact at 0810 hours, in 37°26' N, 07°14' E and ,dropped fourteen depth-charges. With the fleet proceeding at 17 knots on an easterly course, it could not have been the same submarine.
  1 Oct 19410814
(0) Near La Galite.
At 0814 hours, a submarine believed to be Aradam was sighted.
  2 Oct 19410700
(0) Near Cagliari.
At 0700 hours, the submarine Serpente was sighted.

13.Diaspro (DS)16 Oct 19412355Cagliari21 Oct 19411225Cagliari540Sailed with Aradam, Serpente, Turchese and Alagi for patrol north of Cape de Fer between 37°30'N and 37°40'N, and between 06°40'E and 07°20'E on a patrol line with them (the four submarines were spread from 37°10'N to 37°50'N, each occupying a zone 10 miles deep).
  17 Oct 19410715-101038° 27'N, 8° 28'EAt 0700 hours, the submarine Serpente was sighted at 8,000 metres and remained in sight until 1010 hours.
  20 Oct 19411900
1650 (e)
38° 05'N, 8° 00'EAt 1900 hours, three vessels were sighted at over 10,000 metres. They were recognised as destroyers, two of the FEARLESS class and one of the JERVIS class. These were probably the light cruisers HMS Aurora and HMS Penelope and the destroyers HMS Lance and HMS Lively (Force K) proceeding to Malta. Diaspro could not close to carry out an attack.

14.Diaspro (DS)24 Oct 19412305Cagliari3 Nov 19411415Cagliari972Sailed for patrol with Alagi, between 37°15'N and 37°30'N and, and between 05°20'E and 06°00'E. Uneventful. Heard only H.E.

Diaspro (DS)12 Nov 19411845Cagliari14 Nov 19410920Messina345,5Passage Cagliari-Messina, surfaced at 9 knots.

Diaspro (DS)17 Nov 19411035Messina20 Nov 19411435Pola680Passage Messina-Pola, surfaced at 9 knots. The submarine was informed that she might encounter a convoy escorted by the torpedo boat Libra at 0100 hours on the 18th.

Diaspro (DS)22 Nov 19410830Pola22 Nov 19411510Fiume62Passage Pola-Fiume.

Diaspro (DS)26 Feb 19420910Fiume26 Feb 19421800Fiume43Trials escorted by the auxiliary Abbazia.

Giovanni Bausan (BN)18 Mar 19421410Fiume18 Mar 19421700Fiume25Trials.

Giovanni Bausan (BN)25 Mar 19420955Fiume25 Mar 19421600Pola61Passage Fiume-Pola, escorted by the torpedo boat Medici.

Diaspro (DS)2 Apr 19420950Fiume2 Apr 19421830Fiume59Trials, escorted by the torpedo boat T.7.

Diaspro (DS)9 Apr 19421610Fiume9 Apr 19421625Sussa (Fiume)2Passage Fiume-Sussa.

Diaspro (DS)11 Apr 19420850Sussa (Fiume)11 Apr 19421900Sussa (Fiume)19Exercises, escorted by the torpedo boat Insidioso and the auxiliary Jadera.

Diaspro (DS)15 Apr 19421240Sussa (Fiume)16 Apr 19420030Sussa (Fiume)63Exercises, escorted by the torpedo boat Insidioso and the auxiliary Trau.

Diaspro (DS)17 Apr 19421240Sussa (Fiume)17 Apr 19421730Sussa (Fiume)38Exercises with the submarine Bandiera, escorted by the auxiliary Trau.

Diaspro (DS)20 Apr 19422035Sussa (Fiume)21 Apr 19420115Sussa (Fiume)36Exercises, escorted by the auxiliary Trau.

Diaspro (DS)22 Apr 19421225Sussa (Fiume)22 Apr 19422015Sussa (Fiume)28Exercises, escorted by the torpedo boat T.3 and the auxiliary Trau.

Diaspro (DS)24 Apr 19421400Sussa (Fiume)25 Apr 19420035Sussa (Fiume)68Exercises.

Diaspro (DS)25 Apr 19420830Sussa (Fiume)25 Apr 19421110Sussa (Fiume)9Exercises.

Diaspro (DS)27 Apr 19420925Sussa (Fiume)27 Apr 19421240Sussa (Fiume)9Exercises.

Diaspro (DS)27 Apr 19422015Sussa (Fiume)28 Apr 19420040Sussa (Fiume)31Exercises with the submarines Bandiera and Giada, escorted by the torpedo Audace.

Diaspro (DS)1 May 19420650Sussa (Fiume)1 May 19421235Sussa (Fiume)32Exercises, escorted by the torpedo boat Audace.

Diaspro (DS)1 May 19422020Sussa (Fiume)2 May 19420110Sussa (Fiume)28Exercises, escorted by the torpedo boat Audace.

Diaspro (DS)4 May 19421230Sussa (Fiume)5 May 19420200Sussa (Fiume)64Exercises with the submarine Manara, escorted by the torpedo boat Audace.

Diaspro (DS)6 May 19420920Sussa (Fiume)6 May 19421225Sussa (Fiume)18Exercises.

Diaspro (DS)6 May 19421420Sussa (Fiume)6 May 19421710Sussa (Fiume)17Exercises.

Diaspro (DS)8 May 19421410Sussa (Fiume)8 May 19421920Sussa (Fiume)17Exercises with the submarine Manara, escorted by the auxiliary Jadera.

Diaspro (DS)12 May 19421310Sussa (Fiume)13 May 19420200Sussa (Fiume)60Exercises with the submarines Giada and Bandiera, escorted by the torpedo boat T.3.

Diaspro (DS)14 May 19421100Sussa (Fiume)15 May 19420140Sussa (Fiume)68Exercises with the submarine Bandiera, escorted by the torpedo boat Insidioso.

Diaspro (DS)16 May 19420650Sussa (Fiume)16 May 19421350Sussa (Fiume)24,5Exercises.

Diaspro (DS)27 Jun 19420510Fiume27 Jun 19421800Venice131Passage Fiume-Venice to test the "Silenta" apparatus.

Diaspro (DS)30 Jun 19421020Venice30 Jun 19421340Venice13Exercises.

Diaspro (DS)1 Jul 19420950Venice1 Jul 19421430Venice11Exercises.

Diaspro (DS)4 Jul 19420520Venice4 Jul 19421900Fiume133Passage Venice-Fiume.

Diaspro (DS)5 Jul 19420920Fiume5 Jul 19421220Fiume11Exercises.

Diaspro (DS)15 Jul 19421030Fiume15 Jul 19421110Sussa (Fiume)1Passage Fiume-Sussa.

Diaspro (DS)16 Jul 19421426Sussa (Fiume)17 Jul 19420245Sussa (Fiume)46Exercises.

Diaspro (DS)20 Jul 19421500Sussa (Fiume)21 Jul 19420125Sussa (Fiume)34Exercises.

Diaspro (DS)22 Jul 19421305Sussa (Fiume)22 Jul 19422335Sussa (Fiume)31Exercises.

Diaspro (DS)24 Jul 19421300Sussa (Fiume)25 Jul 19420115Sussa (Fiume)48Exercises.

Diaspro (DS)28 Jul 19421235Sussa (Fiume)28 Jul 19421755Sussa (Fiume)26Exercises.

Diaspro (DS)30 Jul 19420735Sussa (Fiume)30 Jul 19421650Sussa (Fiume)72Exercises.

Diaspro (DS)31 Jul 19420300Sussa (Fiume)31 Jul 19421900Sussa (Fiume)46Exercises.

Diaspro (DS)3 Aug 19421315Sussa (Fiume)4 Aug 19420115Sussa (Fiume)50Exercises.

Diaspro (DS)5 Aug 19421235Sussa (Fiume)6 Aug 19420040Sussa (Fiume)52Exercises.

Diaspro (DS)7 Aug 19421230Sussa (Fiume)8 Aug 19420040Sussa (Fiume)57Exercises.

Diaspro (DS)11 Aug 19420935Sussa (Fiume)11 Aug 19421335Sussa (Fiume)14Exercises.

Diaspro (DS)13 Aug 19421425Sussa (Fiume)14 Aug 19420005Sussa (Fiume)56Exercises.

Diaspro (DS)17 Aug 19421430Sussa (Fiume)18 Aug 19420010Sussa (Fiume)56Exercises.

Diaspro (DS)19 Aug 19420735Sussa (Fiume)19 Aug 19420810Fiume2Passage Sussa-Fiume.

Diaspro (DS)26 Aug 19421330Fiume26 Aug 19421700Fiume13Trials.

Diaspro (DS)27 Aug 19420540Fiume27 Aug 19421845Venice127Passage Fiume-Venice.

Diaspro (DS)29 Aug 19420850Venice29 Aug 19421150Venice10Trials.

Diaspro (DS)2 Sep 19420700Venice2 Sep 19421450Pola78,5Passage Venice-Pola.

Diaspro (DS)5 Sep 19421200Pola5 Sep 19421920Pola43Exercises with the torpedo boat Fortunale in 44°45'N, 13°27'E.

Diaspro (DS)10 Sep 19421400Pola15 Sep 19421010Trapani950Passage Pola-Trapani. She was informed that she would probably cross the path of a German submarine (this was U-205) at 1400 hours on the 11th, and the submarine Micca at dawn on the 13th.

Diaspro (DS)24 Oct 19420730Trapani24 Oct 19421235Trapani31Exercises.

15.Diaspro (DS)7 Nov 19420145Trapani14 Nov 19421830Trapani1820,5Patrolled in 37°25'N, 10°15'E to attack an enemy convoy. On 8 November, moved to area between 37°00'N and 37°20'N, and between 06°00'E and 06°20'E.
  8 Nov 1942115835° 25'N, 10° 15'EAt 1158 hours, Diaspro collided with the submarine Alagi as they were proceeding submerge to their patrol areas. Diaspro was at a depth of 12 metres at the time and suffered only minor damages but Alagi had to return to base for repairs.
  12 Nov 1942050536° 46'N, 5° 06'EAt 0456 hours, a large vessel was sighted at a distance of 1,200 metres. She was estimated doing 14 knots.

At 0505 hours, Diaspro fired all four bow tubes (533mm, G7e type) at a range of 800 metres, adjusted for an enemy's speed of 10 knots as the initial speed appeared to have been overestimated. However, the torpedoes had just left the tubes when the vessel altered course to port and they missed.

This was probably the Dutch liner Marnix Van St. Aldegonde (19,355 GRT, built 1930) who anchored off Cape Bouak at 0800 hours coming from Cape Aokas [36°38'45" N, 05°13'54" E] where she had taken refuge the previous day.

At 0510 hours, the submarine had reverted and fired a single stern torpedo from a range of 1,500 metres. At 0513 hours, a double explosion was heard.

No vessels reported being torpedoed at this time.

Diaspro (DS)16 Nov 19421905Trapani17 Nov 19422145Naples237Passage Trapani-Naples.

Diaspro (DS)20 Nov 19420800Naples20 Nov 19421150Naples10Exercises.

Diaspro (DS)25 Nov 19421500Naples26 Nov 19422017La Maddalena231Passage Naples-La Maddalena.

Serpente (ex-Nautilus) (SE)12 Feb 19430920Pola12 Feb 19431120Pola2,5Trials.

Serpente (ex-Nautilus) (SE)15 Feb 19430825Pola15 Feb 19431515Pola32Trials.

Serpente (ex-Nautilus) (SE)24 Feb 19430905Pola24 Feb 19432300Pola41Trials.

Serpente (ex-Nautilus) (SE)3 Mar 19430030Pola3 Mar 19430925Fiume65Passage Pola-Fiume with the torpedo boat Insidioso, escorted out by the torpedo boat T.3.

Ruggiero Settimo (RS)14 Mar 19430300Pola14 Mar 19431030Nazario Sauro (Fiume)57Passage Pola-Nazario Sauro, escorted by torpedo boat T.3.

Ruggiero Settimo (RS)15 Mar 19430915Fiume15 Mar 19432300Fiume51Exercises.

Ruggiero Settimo (RS)17 Mar 19431020Fiume18 Mar 19430030Fiume60Exercises.

Ruggiero Settimo (RS)19 Mar 19431045Fiume19 Mar 19431900Fiume34Exercises.

Ruggiero Settimo (RS)22 Mar 19431030Fiume22 Mar 19432310Fiume55Exercises.

Ruggiero Settimo (RS)24 Mar 19431250Fiume24 Mar 19432250Fiume47Exercises.

Ruggiero Settimo (RS)26 Mar 19431020Fiume26 Mar 19432345Fiume67Exercises.

Ruggiero Settimo (RS)29 Mar 19431310Fiume29 Mar 19431835Fiume25Exercises.

Ruggiero Settimo (RS)30 Mar 19431357Fiume30 Mar 19431722Fiume15Exercises.

Ruggiero Settimo (RS)31 Mar 19431125Fiume31 Mar 19432315Fiume59Exercises.

Ruggiero Settimo (RS)2 Apr 19431325Fiume3 Apr 19430045Fiume65Exercises.

Ruggiero Settimo (RS)5 Apr 19431145Fiume5 Apr 19432315Fiume72Exercises.

Ruggiero Settimo (RS)7 Apr 19431145Fiume7 Apr 19432330Fiume57Exercises.

Ruggiero Settimo (RS)9 Apr 19430920Fiume9 Apr 19432400Fiume76Exercises.

Ruggiero Settimo (RS)12 Apr 19431400Fiume12 Apr 19432310Fiume55Exercises.

Ruggiero Settimo (RS)14 Apr 19431030Fiume14 Apr 19432300Fiume92Exercises.

Ruggiero Settimo (RS)16 Apr 19431000Fiume17 Apr 19430020Fiume76Exercises.

Ruggiero Settimo (RS)19 Apr 19431400Fiume20 Apr 19430015Fiume53Exercises.

Ruggiero Settimo (RS)21 Apr 19431320Fiume22 Apr 19430020Fiume48Exercises.

Ruggiero Settimo (RS)23 Apr 19431300Fiume24 Apr 19430030Fiume60Exercises.

Ruggiero Settimo (RS)26 Apr 19431145Fiume27 Apr 19430045Fiume75Exercises.

Ruggiero Settimo (RS)28 Apr 19431315Fiume29 Apr 19430030Fiume67Exercises.

Ruggiero Settimo (RS)30 Apr 19431200Fiume1 May 19430210Fiume84Exercises.

Ruggiero Settimo (RS)3 May 19431340Fiume3 May 19432340Fiume60Exercises.

Ruggiero Settimo (RS)5 May 19431350Fiume6 May 19430035Fiume56Exercises.

Ruggiero Settimo (RS)7 May 19431440Fiume7 May 19432345Fiume41Exercises.

Ruggiero Settimo (RS)8 May 19431140Fiume8 May 19431340Fiume2Exercises.

Ruggiero Settimo (RS)10 May 19431315Fiume11 May 19430055Fiume56Exercises.

Ruggiero Settimo (RS)12 May 19431305Fiume13 May 19430140Fiume71Exercises.

Ruggiero Settimo (RS)14 May 19431444Fiume15 May 19430200Fiume58Exercises.

Ruggiero Settimo (RS)17 May 19431305Fiume18 May 19430520Fiume62Exercises.

Ruggiero Settimo (RS)19 May 19431215Fiume20 May 19430030Fiume60Exercises.

Ruggiero Settimo (RS)21 May 19431215Fiume22 May 19430039Fiume73Exercises.

Ruggiero Settimo (RS)22 May 19431000Fiume22 May 19431720Fiume38Exercises.

Ruggiero Settimo (RS)24 May 19431220Fiume25 May 19430050Fiume66Exercises.

Ruggiero Settimo (RS)26 May 19431200Fiume27 May 19430225Fiume79Exercises.

Ruggiero Settimo (RS)28 May 19431300Fiume29 May 19430058Fiume62Exercises.

Ruggiero Settimo (RS)31 May 19431200Fiume1 Jun 19430156Fiume76Exercises.

Ruggiero Settimo (RS)2 Jun 19431230Fiume3 Jun 19430130Fiume66Exercises.

Ruggiero Settimo (RS)4 Jun 19431046Fiume5 Jun 19430235Fiume89Exercises.

Ruggiero Settimo (RS)7 Jun 19431030Fiume8 Jun 19430230Fiume84Exercises.

Ruggiero Settimo (RS)9 Jun 19431005Fiume10 Jun 19430215Fiume78Exercises.

Ruggiero Settimo (RS)11 Jun 19431250Fiume11 Jun 19431820Fiume34Exercises.

Ruggiero Settimo (RS)11 Jun 19432130Fiume12 Jun 19430200?Fiume36Exercises.

Ruggiero Settimo (RS)15 Jun 19431205Fiume16 Jun 19430210Fiume80Exercises.

Ruggiero Settimo (RS)17 Jun 19431010Fiume18 Jun 19430125Fiume75Exercises.

Ruggiero Settimo (RS)19 Jun 19431230Fiume20 Jun 19430245Fiume70Exercises.

Ruggiero Settimo (RS)21 Jun 19430945Fiume21 Jun 19431245Fiume32Exercises.

Ruggiero Settimo (RS)21 Jun 19431445Fiume22 Jun 19430100Fiume60Exercises.

Ruggiero Settimo (RS)22 Jun 19431445Fiume23 Jun 19430100Fiume82Exercises.

Ruggiero Settimo (RS)26 Jun 19431240Fiume27 Jun 19430200Fiume67Exercises.

Ruggiero Settimo (RS)28 Jun 19431445Fiume28 Jun 19432145Fiume34Exercises.

Ruggiero Settimo (RS)29 Jun 19431215Fiume29 Jun 19432140Fiume35Exercises.

Ruggiero Settimo (RS)1 Jul 19431215Fiume2 Jul 19430150Fiume70Exercises.

Ruggiero Settimo (RS)3 Jul 19431150Fiume4 Jul 19430130Fiume62Exercises.

Ruggiero Settimo (RS)6 Jul 19431210Fiume7 Jul 19430140Fiume65Exercises.

Ruggiero Settimo (RS)8 Jul 19431220Fiume9 Jul 19430045Fiume59,5Exercises.

Ruggiero Settimo (RS)10 Jul 19431130Fiume11 Jul 19430120Fiume69,6Exercises.

Ruggiero Settimo (RS)14 Jul 19431015Fiume14 Jul 19431710FiumeExercises.

Ruggiero Settimo (RS)14 Jul 19432050Fiume15 Jul 19430220Fiume75Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)16 Jul 19431005Fiume16 Jul 19431725FiumeExercises.

Ruggiero Settimo (RS)16 Jul 19432110Fiume17 Jul 19430035Fiume64Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)19 Jul 19431000Fiume19 Jul 19431700FiumeExercises.

Ruggiero Settimo (RS)19 Jul 19432050Fiume20 Jul 19430240Fiume77Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)21 Jul 19431000Fiume21 Jul 19431845FiumeExercises.

Ruggiero Settimo (RS)21 Jul 19432045Fiume22 Jul 19430100Fiume88Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)23 Jul 19432045Fiume23 Jul 19430130FiumeExercises.

Ruggiero Settimo (RS)23 Jul 19432045Fiume24 Jul 19430100Fiume69Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)24 Jul 19431245Fiume24 Jul 19431815Fiume29Exercises.

Ruggiero Settimo (RS)26 Jul 19431015Fiume26 Jul 19431750FiumeExercises.

Ruggiero Settimo (RS)26 Jul 19432030Fiume27 Jul 19430100Fiume72Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)28 Jul 19431015Fiume28 Jul 19431645FiumeExercises.

Ruggiero Settimo (RS)28 Jul 19432200Fiume29 Jul 19430530Fiume97Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)30 Jul 19431015Fiume30 Jul 19431415Fiume21Exercises.

Ruggiero Settimo (RS)31 Jul 19431025Fiume31 Jul 19431400FiumeExercises.

Ruggiero Settimo (RS)31 Jul 19432115Fiume31 Jul 19432400Fiume52Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)2 Aug 19431020Sussa (Fiume)2 Aug 19431715Sussa (Fiume)Exercises.

Ruggiero Settimo (RS)2 Aug 19432030Sussa (Fiume)3 Aug 19430130Sussa (Fiume)64Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)4 Aug 19431000Sussa (Fiume)4 Aug 19431830Sussa (Fiume)Exercises.

Ruggiero Settimo (RS)4 Aug 19432100Sussa (Fiume)5 Aug 19430120Sussa (Fiume)76Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)6 Aug 19431020Sussa (Fiume)6 Aug 19431730Sussa (Fiume)Exercises.

Ruggiero Settimo (RS)6 Aug 19432030Sussa (Fiume)7 Aug 19430150Sussa (Fiume)66Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)7 Aug 19431215Sussa (Fiume)7 Aug 19431730Sussa (Fiume)31Exercises.

Ruggiero Settimo (RS)9 Aug 19431020Sussa (Fiume)9 Aug 19431710Sussa (Fiume)Exercises.

Ruggiero Settimo (RS)9 Aug 19432055Sussa (Fiume)10 Aug 19430040Sussa (Fiume)62Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)11 Aug 19430600Sussa (Fiume)11 Aug 19431715Sussa (Fiume)Trials.

Ruggiero Settimo (RS)11 Aug 19432050Sussa (Fiume)12 Aug 19430030Sussa (Fiume)100Trials [mileage includes morning sortie].

Ruggiero Settimo (RS)13 Aug 19431015Sussa (Fiume)13 Aug 19431600Sussa (Fiume)Exercises.

Ruggiero Settimo (RS)13 Aug 19432045Sussa (Fiume)14 Aug 19430300Sussa (Fiume)74Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)14 Aug 19431230Sussa (Fiume)14 Aug 19431955Sussa (Fiume)38Exercises.

Ruggiero Settimo (RS)16 Aug 19431030Sussa (Fiume)16 Aug 19431710Sussa (Fiume)Exercises.

Ruggiero Settimo (RS)16 Aug 19432040Sussa (Fiume)17 Aug 19430345Sussa (Fiume)72Exercises [mileage includes morning sortie].

Ruggiero Settimo (RS)20 Aug 19430540Sussa (Fiume)20 Aug 19431340Sussa (Fiume)40Exercises.

Ruggiero Settimo (RS)23 Aug 19431100Sussa (Fiume)23 Aug 19431200Fiume9Passage Sussa-Fiume for docking.

Ruggiero Settimo (RS)9 Sep 19432300Fiume12 Sep 19431210Taranto530Passage Fiume-Taranto to surrender. She was used for A/S exercises in Taranto. She carried out seventy-three sorties of exercises for a total of 650 hours in 1943-1944. Disarmed the following summer.
  11 Sep 19431800An unknown MTB was sighted at long range and the submarine prudently dived.
  12 Sep 19430930The Italian submarine Otaria was sighted and recognition signals were exchanged.

Ruggiero Settimo (RS)22 Oct 19430600Taranto22 Oct 19431243Taranto25Exercises.

Ruggiero Settimo (RS)30 Oct 19430635Taranto30 Oct 19431332Taranto32Exercises.

Ruggiero Settimo (RS)11 Nov 19430748Taranto11 Nov 19431710Taranto28Exercises.

Ruggiero Settimo (RS)16 Nov 19430730Taranto16 Nov 19431139Taranto20Exercises.

Ruggiero Settimo (RS)23 Nov 19430632Taranto23 Nov 19431215Taranto20Exercises with the torpedo boats Calliope and Fabrizi.

Ruggiero Settimo (RS)30 Nov 19430654Taranto30 Nov 19431345Taranto24Exercises with the corvette Minerva and the torpedo boat Fabrizi.

Ruggiero Settimo (RS)7 Dec 19430632Taranto7 Dec 19431512Taranto30Exercises.

Ruggiero Settimo (RS)11 Dec 19430707Taranto11 Dec 19431348Taranto25Exercises.

Ruggiero Settimo (RS)14 Dec 19430700Taranto14 Dec 19431800Taranto38Exercises with the torpedo boats Indomito, Aretusa, Abba and Pilo and the corvette Urania.

Ruggiero Settimo (RS)18 Dec 19430845Taranto18 Dec 19431800Taranto26,5Exercises with the torpedo boats Indomito and Aretusa, the corvettes Urania and Gabbiano and the tug Ercole.

Ruggiero Settimo (RS)28 Dec 19430632Taranto28 Dec 19430800Taranto11Exercises.

Ruggiero Settimo (RS)30 Dec 19430700Taranto30 Dec 19431333Taranto24,5Exercises.

Marcantonio Bragadino (BG)12 Jun 19441910Taranto12 Jun 19442040Taranto (Mar Grande)5Exercises.

Marcantonio Bragadino (BG)13 Jun 19440500Taranto (Mar Grande)13 Jun 19440630Taranto5Return trip [just before - at 0000-0300 hours - trained in port with Mezzi d'assalto who set limpets on the hull]. Held in reserve until the end of war.

212 entries. 206 total patrol entries (15 marked as war patrols) and 15 events.

Italian Commanders

Italian Submarines