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SM U-31 (Austria-Hungary)

SM U-31 or U-XXXI was a U-27 class U-boat or submarine for the Austro-Hungarian Navy U-31, built by the Hungarian firm of Ganz Danubius at Fiume, was launched in March 1917 and commissioned in April

U-31 had a single hull and was just over 121 feet 37 m in length She displaced nearly 265 metric tons 261 long tons when surfaced and over 300 metric tons 295 long tons when submerged Her two diesel engines moved her at up to 9 knots 17 km/h; 10 mph on the surface, while her twin electric motors propelled her at up to 75 knots 139 km/h; 86 mph while underwater She was armed with two bow torpedo tubes and could carry a load of up to four torpedoes She was also equipped with a 75 mm 30 in deck gun and a machine gun

In October 1917, U-31 sank while in port at Porto Bergudi and was out of service through April 1918 while she was raised and repaired During her service career, U-31 sank two ships and damaged one warship, sending a combined tonnage of 4,088 GRT to the bottom U-31 was at Cattaro at war's end and was awarded to France as war reparation in 1920, towed to Bizerta and scrapped there5

Design and constructionedit

Austria-Hungary's U-boat fleet was largely obsolete at the outbreak of World War I6 The Austro-Hungarian Navy satisfied its most urgent needs by purchasing five Type UB I submarines that comprised the U-10 class from Germany,7 by raising and recommissioning the sunken French submarine Curie as U-14,6Note 1 and by building four submarines of the U-20 class that were based on the 1911 Danish Havmanden class3Note 2

After these steps alleviated their most urgent needs,6 the Austro-Hungarian Navy selected the German Type UB II design for its newest submarines in mid 19158 The Germans were reluctant to allocate any of their wartime resources to Austro-Hungarian construction, but were willing to sell plans for up to six of the UB II boats to be constructed under license in Austria-Hungary8 The Austro-Hungarian Navy agreed to the proposal and purchased the plans from AG Weser of Bremen9

U-31 displaced 264 metric tons 260 long tons surfaced and 301 metric tons 296 long tons submerged3 She had a single hull with saddle tanks,10 and was 121 feet 1 inch 3691 m long with a beam of 14 feet 4 inches 437 m and a draft of 12 feet 2 inches 371 m3 For propulsion, she had two shafts, twin diesel engines of 270 bhp 200 kW for surface running, and twin electric motors of 280 shp 210 kW for submerged travel She was capable of 9 knots 167 km/h while surfaced and 75 knots 139 km/h while submerged3 Although there is no specific notation of a range for U-31 in Conway's All the World's Fighting Ships, 1906–1921, the German UB II boats, upon which the U-27 class was based, had a range of over 6,000 nautical miles 11,000 km at 5 knots 93 km/h surfaced, and 45 nautical miles 83 km at 4 knots 74 km/h submerged10 U-27-class boats were designed for a crew of 23–243

U-31 was armed with two 45 cm 177 in bow torpedo tubes and could carry a complement of four torpedoes She was also equipped with a 75 mm/26 30 in deck gun and an 8 mm 031 in machine gun3

After intricate political negotiations to allocate production of the class between Austrian and Hungarian firms,8 U-27 was ordered from Ganz Danubius on 12 October 19151 She was laid down on 4 July 1916 at Fiume and launched on 20 March 1917

Service careeredit

After undergoing trials at Fiume during March, U-31 made a training voyage to Brioni in April2 On 24 April 1917, SM U-31 was commissioned into the Austro-Hungarian Navy under the command of Linienschiffsleutnant Franz Nejebsy4 Nejebsy, a 32-year-old native of Teplitz-Schönau, Bohemia present-day Czech Republic, had previously served two stints as commander of U-111 U-31 departed from Pola on 29 May to patrol along the Adriatic coast of Italy and returned on 5 June U-31 departed for a patrol in the Mediterranean on 19 June After a problem with a pump required a stop at Brioni, the U-boat continued on Nejebsy launched a torpedo attack on an armed yacht west of Strovathi on 25 June, but the torpedoes missed their mark U-31 ended her patrol at Cattaro after ventilation problems kept the temperature in the engine room from falling below 45 °C 113 °F2

After a month of repairs at Cattaro, U-31 headed out on another patrol on 6 August On each of the next two days the U-boat had to crash dive to avoid bombing attacks by French airplanes, the second day's attack damaging the boat slightly2 On 10 August, Nejebsy and U-31 scored their first kill with the sinking of am Italian cargo ship The 4,021-ton Lealta was carrying ammunition from Syracuse to Malta when U-31 intercepted her in the Ionian Sea east of Malta212 An escorting destroyer dropped a pattern of ten depth charges over U-31 The following day, Nejebsy was maneuvering U-31 into position to attack a convoy when the U-boat was rammed from behind by a destroyer U-31's periscope was hit and twisted by the impact, forcing Nejebsy to end his attack and U-31's patrol On the way back to Cattaro, U-31 was attacked by an aircraft in the Straits of Otranto, but reached the safety of the port on 15 August2

U-31 was assigned to patrol the Austro-Hungarian and Albanian coasts over the next six weeks She headed to Fiume via Spalato on 16 October, reaching there three days later On 26 October U-31 sank from an unknown cause in the harbor at Porto Bergudi When raised from her resting depth of 8 metres 26 ft the next day, one crewman was found alive inside the boat U-31 was taken first to the Danubius shipyard at nearby Fiume, and, later, on to Pola for repairs and trials2

In January, while U-31's repairs were still ongoing, Nejebsy was reassigned, leaving the U-boat without a commander for the next three months On 11 March Linienschiffsleutnant Hermann Rigele was transferred from the helm of U-20 to assume command of U-31 Rigele, who had been born in Sarajevo, was 26 years old and had also been in command of U-17 and, before that, U-10 at age 2513Note 3 Rigele and U-31 departed Pola on 30 April for a three-day cruise to Cattaro via Sebenico On 20 May, the boat left Cattaro for a Mediterranean patrol, but had to turn back with leaks after a day2

In June, the Austro-Hungarian Navy planned an assault on the Otranto Barrage, similar to a May 1917 action that evolved into the Battle of Otranto Straits14 U-31 was deployed from Cattaro on 9 June in advance of the attack2 One of the seven separate groups participating in the attack—dreadnoughts Tegetthoff and Szent István—came under attack from Italian MAS torpedo boats in the early morning hours of 10 June Szent István was hit and sank just after 06:00, and the entire operation was called off14 U-31 returned to Cattaro on 12 June2

On 16 June, Rigele and U-31 again set out for a Mediterranean patrol, but had to immediately return with clutch problems Two days later, the U-boat set out again for the Mediterranean The next day, 19 June, Rigele had to take the boat to a depth of 40 metres 130 ft to avoid a depth charge attack On 7 July, Rigele stopped the Italian sailing vessel Giuseppino Padre and, using explosive charges, sank the 67-ton ship2Note 4 U-31 ended her patrol at Cattaro on 10 July2 Over the next two months, the submarine operated in the Adriatic out of Cattaro and Pola, patrolling off Durazzo and the Albanian coast2

After the Armistice with Bulgaria on 29 September ended Bulgaria's participation in the war, Durazzo gained importance to the remaining Central Powers as the main port for supplying their forces fighting in the Balkans Anticipating this, the Allies put together a force to bombard Durazzo While the second echelon of the attacking force got into position to shell the town, U-31 and sister boat U-29, both patrolling off Durazzo, maneuvered to attack Although U-29 was blocked by screening ships and experienced a heavy depth charge attack, U-31 was able to get in position to launch torpedoes at the British cruiser Weymouth15 One of them hit its mark and blew the stern off of Weymouth,2 killing four sailors in the process16 The other British cruisers involved in the attack took the damaged Weymouth under tow and departed2 United States Navy submarine chasers were involved in the depth charge attacks on U-29 and U-31 and erroneously claimed that they had sunk both of the submarines17 U-31 was able to make her way back to Cattaro on 6 October2

Over the next three weeks, U-31 patrolled between Cattaro and Antivari, Montenegro After her arrival back at Cattaro on 26 October, she remained there until she was awarded to France as a war reparation in 1920 U-31 was towed, along with sister boats U-29 and U-41, from Cattaro for scrapping at Bizerta5 In total, U-31 sank two ships with a combined tonnage of 4,088, and damaged one warship

Ships sunk or damagededit

Ships sunk or damaged by SM U-3118
Date Name Tonnage Nationality
000000001917-08-10-000010 August 1917 Lealta 4,021 Italian
000000001918-07-07-00007 July 1918 Giuseppino Padre2Note 4 67 Italian
000000001918-10-02-00002 October 1918 WeymouthHMS Weymouth 5,250 British

damaged but not sunk


  1. ^ Curie had been caught in an anti-submarine net while trying to enter the harbor at Pola on 20 December 1914 See: Gardiner, p 343
  2. ^ The plans for the Danish Havmanden class submarines, three of which were built in Austria-Hungary, were seized from Whitehead & Co in Fiume See: Gardiner, pp 344, 354
  3. ^ Rigele went on to command two German U-boats in the Second World War, UD-1 and UD-3, both captured Dutch submarines See: Helgason, Guðmundur "WWI U-boat commanders: Hermann Rigele" German and Austrian U-boats of World War I - Kaiserliche Marine - Uboatnet Retrieved 22 January 2009 
  4. ^ a b Uboatnet credits the sinking of Giuseppino Padre to U-31's sister boat U-27 See: Helgason, Guðmundur "Ships hit during WWI: Giuseppino Padre" German and Austrian U-boats of World War I - Kaiserliche Marine - Uboatnet Retrieved 22 January 2009 


  1. ^ a b Miller, p 20
  2. ^ a b c d e f g h i j k l m n o p q "Tengeralattjárók" pdf in Hungarian Imperial and Royal Navy Association pp 25–26 Retrieved 22 January 2009 
  3. ^ a b c d e f g h i j k l m n o Gardiner, p 344
  4. ^ a b c d Helgason, Guðmundur "WWI U-boats: KUK U31" German and Austrian U-boats of World War I - Kaiserliche Marine - Uboatnet Retrieved 22 January 2009 
  5. ^ a b Gibson and Prendergast, pp 388–89
  6. ^ a b c Gardiner, p 341
  7. ^ Gardiner, p 343
  8. ^ a b c Halpern, p 383
  9. ^ Baumgartner and Sieche, as excerpted here reprinted and translated into English by Sieche Retrieved 1 December 2008
  10. ^ a b Gardiner, p 181
  11. ^ Helgason, Guðmundur "WWI U-boat commanders: Franz Nejebsy" German and Austrian U-boats of World War I - Kaiserliche Marine - Uboatnet Retrieved 22 January 2009 
  12. ^ Helgason, Guðmundur "Ships hit during WWI: Lealta" German and Austrian U-boats of World War I - Kaiserliche Marine - Uboatnet Retrieved 22 January 2009 
  13. ^ Helgason, Guðmundur "WWI U-boat commanders: Hermann Rigele" German and Austrian U-boats of World War I - Kaiserliche Marine - Uboatnet Retrieved 22 January 2009 
  14. ^ a b Halpern, pp 174–75
  15. ^ Halpern, pp 175–76
  16. ^ Helgason, Guðmundur "Ships hit during WWI: Weymouth hms" German and Austrian U-boats of World War I - Kaiserliche Marine - Uboatnet Retrieved 22 January 2009 
  17. ^ Gibson and Prendergast, p 274, note 1
  18. ^ Helgason, Guðmundur "Ships hit by KUK U31" German and Austrian U-boats of World War I - Kaiserliche Marine - Uboatnet Retrieved 22 January 2009 


  • Baumgartner, Lothar; Erwin Sieche 1999 Die Schiffe der kuk Kriegsmarine im Bild = Austro-Hungarian warships in photographs in German Wien: Verlagsbuchhandlung Stöhr ISBN 978-3-901208-25-6 OCLC 43596931 
  • Gardiner, Robert, ed 1985 Conway's All the World's Fighting Ships, 1906–1921 Annapolis, Maryland: Naval Institute Press ISBN 978-0-87021-907-8 OCLC 12119866 CS1 maint: Extra text: authors list link
  • Gibson, R H; Prendergast, Maurice 2003 1931 The German Submarine War, 1914–1918 Annapolis, Maryland: Naval Institute Press ISBN 978-1-59114-314-7 OCLC 52924732 
  • Halpern, Paul G 1994 A Naval History of World War I Annapolis, Maryland: Naval Institute Press ISBN 978-0-87021-266-6 OCLC 28411665 
  • Miller, David 2002 The Illustrated Directory of Submarines of the World St Paul, Minnesota: MBI Pub Co ISBN 978-0-7603-1345-9 OCLC 50208951 
  • Tennent, A J 2006 1990 British Merchant Ships Sunk by U boats in the 1914–1918 War Penzance: Periscope Publishing ISBN 1-904381-36-7 

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