SM UB-50

Last updated
UB 148 at sea 2.jpeg
UB-148 at sea, a U-boat similar to UB-50.
History
War Ensign of Germany 1903-1918.svg German Empire
NameUB-50
Ordered20 May 1916 [1]
Builder Blohm & Voss, Hamburg
Cost3,276,000 German Papiermark
Yard number295
Launched6 January 1917
Commissioned12 July 1917
FateSurrendered 16 January 1919; broken up at Swansea [2]
General characteristics [2]
Class and type Type UB III submarine
Displacement
  • 516  t (508 long tons) surfaced
  • 651 t (641 long tons) submerged [2]
Length55.30 m (181 ft 5 in) (o/a) [2]
Beam5.80 m (19 ft) [2]
Draught3.68 m (12 ft 1 in) [2]
Propulsion
Speed
  • 13.6 knots (25.2 km/h; 15.7 mph) surfaced
  • 8 knots (15 km/h; 9.2 mph) submerged [2]
Range
  • 9,040  nmi (16,740 km; 10,400 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced
  • 55 nmi (102 km; 63 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged [2]
Test depth50 m (160 ft)
Complement3 officers, 31 men [2]
Armament
Service record
Part of:
  • Mittelmeer / Mittelmeer II Flotilla
  • 30 September 1917 – 11 November 1918
Commanders:
  • Kptlt. Franz Becker [1]
  • 12 July 1917 – 30 June 1918
  • Oblt.z.S. Heinrich Kukat [1]
  • 1 July – 29 November 1918
Operations: 7 patrols
Victories:
  • 38 merchant ships sunk
    (97,922  GRT) [1]
  • 2 warships sunk
    (16,499 tons)
  • 7 merchant ships damaged
    (25,172  GRT)

SM UB-50 was a German Type UB III submarine or U-boat in the German Imperial Navy (German : Kaiserliche Marine) during World War I. The U-boat was ordered on 20 May 1916. She was commissioned into the Pola Flotilla of the German Imperial Navy on 12 July 1917 as SM UB-50. [Note 1]

Contents

The submarine conducted seven patrols and sank 40 ships during the war for a total loss of 97,922  gross register tons  (GRT) and 16,499 tons. She operated as part of the Pola Flotilla based in Cattaro. UB-50 surrendered on 16 January 1919 with the remainder of the Pola Flotilla following an order by Admiral Reinhard Scheer to return to port. During her passage through the Straits of Gibraltar, she managed to sink the battleship HMS Britannia. UB-50 was later broken up at Swansea. [2]

Construction

UB-50 was ordered by the German Imperial Navy on 20 May 1916. She was built by Blohm & Voss, Hamburg and following just under a year of construction, launched at Hamburg on 6 January 1917. UB-50 was commissioned later that same year under the command of Kapitänleutnant (Kptlt.) Franz Becker. Like all Type UB III submarines, UB-50 carried 10 torpedoes and was armed with an 8.8 cm (3.5 in) SK L/30 deck gun. UB-50 could carry a crew of up to 34 men and had a cruising range of 9,040 nautical miles (16,740 km; 10,400 mi). [2] UB-50 had a displacement of 516  t (508 long tons) while surfaced and 651 t (641 long tons) when submerged. Her engines enabled her to travel at 13.6 knots (25.2 km/h; 15.7 mph) when surfaced and 8 knots (15 km/h; 9.2 mph) when submerged. [2]

Service history

First patrol

Soon after she left Pola, UB-50 encountered the William H. Crawford, a 1,593  GRT American sailing ship. It sank after an attack from the U-boat stopped her. [3] Four days later, UB-50 sighted the 800  GRT British barge R.B.40. UB 50 launched a torpedo which instead hit the British tug towing the ship, the 121  GRT H.s.3. The tug sank, but the barge was not sunk. [4] The following day, UB-50 found two Portuguese sailboats Correiro De Sines and Comizianes Da Graca at 32  GRT and 32  GRT respectively. [5] They were sunk 6 nautical miles (11 km; 6.9 mi) north of Cape Sines. [6] A day later, she found the Portuguese 196  GRT ship Sado, which she sank about 16 nautical miles (30 km; 18 mi) south of her prey the day before. [7] Four days later, UB-50 finally encountered and sank a merchant, this being the 3,611  GRT British Polar Prince, carrying coal for Malta. [8] Two days later, she sank the Fabian, a 2,246  GRT British steamer going to Liverpool, killing three. [9] Later that day, she sank the Gioffredo Mameli, a 4,124  GRT ton Italian steamer carrying ore. [10] The 2,464  GRT coal carrying Greek steamer Alkyon was attacked two days later by UB-50, sinking close off Oran. [11] The UB 50 followed up with the sinking of the 1,670  GRT Norwegian steamer John Knudsen, killing one. [12] Four days later, the 296  GRT Italian sailboat Ciro was scuttled after being hit by UB-50, [13] the last ship she would sink before returning to base.

Second patrol

SM UB-50 began her second patrol with the sinking of the Marc Fraissinet, a 3,060  GRT French steamer carrying wood, munitions, and hay to Bizerte. It sank 15 nautical miles (28 km; 17 mi) north of Tabarca after being torpedoed by UB-50. [14] Later that day UB 50 encountered the Senegal, an 845  GRT Italian steamer, sinking her off the coast of Algeria with no casualties. [15] Three days after that, the Margram Abbey, a 4,367  GRT British steamer carrying coal, was found and torpedoed by UB-50. It was beached off the coast of Algeria, but the torpedo damage, which killed two, had wrecked the ship. [16] UB 50 attacked the Antaeus, a 3,061  GRT British steamer, three days later off Cape Bon. There were no casualties, but the captain was taken prisoner. On the following day, UB 50 torpedoed the Amberton, a 4,556  GRT British steamer, but she was only damaged. [17] Four days later, the submarine found her last target of her second patrol, the 2,774  GRT American steamer Rizal, which sank 9 nautical miles (17 km; 10 mi) from Cape Cavallo. [18]

Third patrol

UB-50 started out her third patrol by finding and sinking the 96  GRT Italian sailboat S. Giuseppe B. off the coast of Africa. [19] She sank the 8,293  GRT British steamer City of Lucknow two days later 50 nautical miles (93 km; 58 mi) northeast of the Cani Rocks. [20] On Christmas Day, 1917, UB-50 sank the Sant’ Antonio, an 843  GRT Italian sailing vessel, by gunfire near Bizerte. [21] On New Year's Day, 1918, the Egyptian Transport, a 4,648  GRT British steamer, was damaged during an attack by UB-50, which killed five men. It was later beached but refloated. [22] Two days later, the Allanton, a 4,253  GRT British steamer carrying coal, was sunk by UB-50, [23] which also sunk the Steelville, a 3,649  GRT British steamer also carrying coal later that day. [24] Four days later, UB-50 torpedoed the Arab, a 4,191  GRT British steamer coal off the coast of Cape Serrat, killing 21. [25]

Fourth patrol

UB-50's fourth patrol was very successful. In less than a month, she sank six vessels. The first victim was the 2,457  GRT French steamer Saint Jean Ii, which went down 22 March 1918 off Cap Bon. [26] That same day, UB-50 managed to damage the British steamer Shadwell off Bizerta. [27] Four days later UB-50 sank the 11,495  GRT Italian steamer Volturno off Bone (Annaba), Algeria. [28] On 6 April, UB-50 sank the French vessel Madeleine Iii and on 11 April, she sank the Italian sailing ship Carmela G and the British vessel Highland Prince. [29] [30]

Fifth patrol

UB-50 began her fifth war patrol by damaging the 3,926  GRT British steamer Elswick Grange carrying coal off the coast of Oran, killing one. [31] Two days later, she ran across the 3,152  GRT British steamer Mavisbrook carrying coal. She was torpedoed south east of Cabo de Gata, killing 18. [32] On that same day, she came upon the 168  GRT Danish three-masted iron-hulled schooner Kirstine Jesen, sinking after being fired upon from UB-50's deck gun with no deaths. [33] Two days later, the New Sweden, a 5,319  GRT Swedish steamer, was hit by UB-50 and sank. [34] Two days later, UB-50 found the 180  GRT Spanish steamer Maria Pia, which sank with no casualties. [35] Three days after that, the 117  GRT French sailboat Animal Lafont and 257  GRT Italian sailboat Santa Teresa were torpedoed by the U-boat with no casualties. [36] [37]

Sixth patrol

Shortly before her sixth patrol, Oberleutnant zur See Heinrich Kukat took over command from Kptlt. Becker. [38] On her sixth patrol, UB-50 encountered the Imber, a 2,514  GRT British steamer and torpedoed her south of Cape St. Maria di Leuca, though she survived. [39] Three days later, UB-50 sank the War Swallow, a 5,216  GRT British merchant ship carrying coal from the River Tyne to Port Said. [40] Another three days passed before UB-50 found her next target, the Italian steamer Adria 1, a ship carrying cotton from Palermo to Tunis. It sank, but there were no deaths. [41] Two days later, the 5,257  GRT British steamer Upada was torpedoed by UB-50 killing three, but was only damaged. [42] UB-50 sank the Messidor, a 3,883  GRT British coal steamer two days later, sinking the ship and killing one. [43] The following day, she torpedoed the Rutherglen, a 4,214  GRT British steam merchant carrying coal. [44] That was followed by an attack on the Magellan, a 3,642  GRT British steamer on the following day. She sank with one man. [45] The last ship sunk on the patrol was the Antonio S., a 175  GRT Italian sailboat sunk off the coast of Tunisia. [46]

Seventh patrol

Britannia sinking in the Atlantic off Cape Trafalgar on 9 November 1918. HMS Britannia (1904) sinking on 9 November 1918.jpg
Britannia sinking in the Atlantic off Cape Trafalgar on 9 November 1918.

On 9 November 1918, two days before the Armistice with Germany, UB-50 sank the British battleship HMS Britannia. The Britannia was on a voyage to Gibraltar when she was torpedoed off Cape Trafalgar. [47] After the initial explosion, the ship began listing ten degrees to port. A few minutes later, another explosion started a fire in a 9.2 in (230 mm) magazine, which resulted in a cordite explosion in the magazine. The Britannia stayed at 10-degrees for 2½ hours before sinking. [1] [47] Its 16,350-tons made it the largest ship the U-boat ever sank, and the only one UB-50 would sink during her last patrol. [48]

Summary of raiding history

DateNameNationalityTonnage [Note 2] Fate [48]
8 September 1917 William H. Clifford Flag of the United States (1912-1959).svg  United States 1,593Sunk
12 September 1917 HS 3 Civil Ensign of the United Kingdom.svg  United Kingdom 121Sunk
12 September 1917 RB 10 Civil Ensign of the United Kingdom.svg  United Kingdom 800Sunk
13 September 1917 Gomizianes Da Graça Odemira Flag of Portugal.svg  Portugal 32Sunk
13 September 1917 Correiro De Sines Flag of Portugal.svg  Portugal 32Sunk
14 September 1917 Sado Flag of Portugal.svg  Portugal 196Sunk
18 September 1917 Polar Prince Civil Ensign of the United Kingdom.svg  United Kingdom 3,611Sunk
20 September 1917 Fabian Civil Ensign of the United Kingdom.svg  United Kingdom 2,246Sunk
20 September 1917 Gioffredo Mameli Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 4,124Sunk
22 September 1917 Alkyon Flag of Greece (1822-1978).svg  Greece 2,464Sunk
22 September 1917 John Knudsen Flag of Norway.svg  Norway 1,670Sunk
26 September 1917 Ciro Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 296Sunk
28 October 1917 Marc Fraissinet Flag of France.svg  France 3,060Sunk
28 October 1917 Senegal Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 845Sunk
1 November 1917 Margam Abbey Civil Ensign of the United Kingdom.svg  United Kingdom 4,367Sunk
4 November 1917 Antaeus Civil Ensign of the United Kingdom.svg  United Kingdom 3,061Sunk
5 November 1917 Amberton Civil Ensign of the United Kingdom.svg  United Kingdom 4,556Damaged
9 November 1917 Rizal Flag of the United States (1912-1959).svg  United States 2,744Sunk
19 December 1917 S. Giuseppe B. Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 96Sunk
21 December 1917 City Of Lucknow Civil Ensign of the United Kingdom.svg  United Kingdom 8,293Sunk
25 December 1917 Sant’ Antonio Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 843Sunk
1 January 1918 Egyptian Transport Civil Ensign of the United Kingdom.svg  United Kingdom 4,648Damaged
3 January 1918 Allanton Civil Ensign of the United Kingdom.svg  United Kingdom 4,253Sunk
3 January 1918 Steelville Civil Ensign of the United Kingdom.svg  United Kingdom 3,649Sunk
7 January 1918 Arab Civil Ensign of the United Kingdom.svg  United Kingdom 4,191Sunk
22 March 1918 Saint Jean II Flag of France.svg  France 2,457Sunk
22 March 1918 Shadwell Civil Ensign of the United Kingdom.svg  United Kingdom 4,091Damaged
26 March 1918 Volturno Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 11,495Sunk
6 April 1918 Madeleine III Civil and Naval Ensign of France.svg  French Navy 149Sunk
11 April 1918 Carmela G Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 41Sunk
11 April 1918 Highland Prince Civil Ensign of the United Kingdom.svg  United Kingdom 3,390Sunk
17 May 1918 Elswick Grange Civil Ensign of the United Kingdom.svg  United Kingdom 3,926Damaged
17 May 1918 Mavisbrook Civil Ensign of the United Kingdom.svg  United Kingdom 3,152Sunk
19 May 1918 Kirstine Jensen Flag of Denmark.svg  Denmark 168Sunk
20 May 1918 New Sweden Flag of Sweden.svg  Sweden 5,319Sunk
22 May 1918 Maria Pia Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 180Damaged
25 May 1918 Amiral Lafont Flag of France.svg  France 117Sunk
25 May 1918 Santa Teresa Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 257Sunk
13 July 1918 Imber Civil Ensign of the United Kingdom.svg  United Kingdom 2,514Damaged
16 July 1918 War Swallow Civil Ensign of the United Kingdom.svg  United Kingdom 5,216Sunk
19 July 1918 Adria 1 Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 1,809Sunk
21 July 1918 Upada Civil Ensign of the United Kingdom.svg  United Kingdom 5,257Damaged
23 July 1918 Messidor Civil Ensign of the United Kingdom.svg  United Kingdom 3,883Sunk
24 July 1918 Rutherglen Civil Ensign of the United Kingdom.svg  United Kingdom 4,214Sunk
25 July 1918 Magellan Civil Ensign of the United Kingdom.svg  United Kingdom 3,642Sunk
27 July 1918 Antonio S. Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy 175Sunk
9 November 1918 HMS Britannia Naval Ensign of the United Kingdom.svg  Royal Navy 16,350Sunk

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References

Notes

  1. "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.
  2. Merchant ship tonnages are in gross register tons. Military vessels are listed by tons displacement.

Citations

  1. 1 2 3 4 5 Helgason, Guðmundur. "WWI U-boats: UB 50". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 April 2010.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 Gröner 1991, pp. 25–30.
  3. Helgason, Guðmundur. "Ships hit during WWI: William H. Clifford". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  4. Helgason, Guðmundur. "Ships hit during WWI: Tug H.s.3". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  5. Helgason, Guðmundur. "Ships hit during WWI: Correiro De Sines". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  6. Helgason, Guðmundur. "Ships hit during WWI: Comizianes Da Graca". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  7. Helgason, Guðmundur. "Ships hit during WWI: Sado". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  8. Helgason, Guðmundur. "Ships hit during WWI: Steamer Polar Prince". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  9. Helgason, Guðmundur. "Ships hit during WWI: Steamer Fabian". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  10. Helgason, Guðmundur. "Ships hit during WWI: Steamer Gioffredo Mameli". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  11. Helgason, Guðmundur. "Ships hit during WWI: Steamer Alkyon". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  12. Helgason, Guðmundur. "Ships hit during WWI: Steamer John Knudsen". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  13. Helgason, Guðmundur. "Ships hit during WWI: Sailing vessel Ciro". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 2 May 2010.
  14. Helgason, Guðmundur. "Ships hit during WWI: Steamer Marc Fraissinet". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  15. Helgason, Guðmundur. "Ships hit during WWI: Steamer Senegal". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  16. Helgason, Guðmundur. "Ships hit during WWI: Steamer Margam Abbey". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  17. Helgason, Guðmundur. "Ships hit during WWI: Steamer Amberton". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  18. Helgason, Guðmundur. "Ships hit during WWI: Steamer Rizal". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  19. Helgason, Guðmundur. "Ships hit during WWI: Sailing vessel S. Giuseppe B." German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  20. Helgason, Guðmundur. "Ships hit during WWI: Steamer City Of Lucknow". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  21. Helgason, Guðmundur. "Ships hit during WWI: Sailing vessel Sant' Antonio". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  22. Helgason, Guðmundur. "Ships hit during WWI: Steamer Egyptian Transport". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  23. Helgason, Guðmundur. "Ships hit during WWI: Steamer Allanton". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  24. Helgason, Guðmundur. "Ships hit during WWI: Steamer Steelville". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  25. Helgason, Guðmundur. "Ships hit during WWI: Steamer Arab". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  26. Helgason, Guðmundur. "Ships hit during WWI: Steamer Saint Jean Ii". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  27. Helgason, Guðmundur. "Ships hit during WWI: Steamer Shadwell". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  28. Helgason, Guðmundur. "Ships hit during WWI: Steamer Volturno". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  29. Helgason, Guðmundur. "Ships hit during WWI: Sailing vessel Carmela G". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 May 2010.
  30. Helgason, Guðmundur. "Ships hit during WWI: Q-ship Madeleine III". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 May 2010.
  31. Helgason, Guðmundur. "Ships hit during WWI: Elswick Grange". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 5 May 2010.
  32. Helgason, Guðmundur. "Ships hit during WWI: Mavisbrook". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 5 May 2010.
  33. Helgason, Guðmundur. "Ships hit during WWI: Kirstine Jensen". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 5 May 2010.
  34. Helgason, Guðmundur. "Ships hit during WWI: New Sweden". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 5 May 2010.
  35. Helgason, Guðmundur. "Ships hit during WWI: Maria Pia". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 5 May 2010.
  36. Helgason, Guðmundur. "Ships hit during WWI: Animal Lafont". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 5 May 2010.
  37. Helgason, Guðmundur. "Ships hit during WWI: Santa Teresa". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 5 May 2010.
  38. Bendert 2000, p. 130.
  39. Helgason, Guðmundur. "Ships hit during WWI: Steamer Imber". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  40. Helgason, Guðmundur. "Ships hit during WWI: Steamer War Swallow". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  41. Helgason, Guðmundur. "Ships hit during WWI: steamer Adria 1". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  42. Helgason, Guðmundur. "Ships hit during WWI: Steamer Upada". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  43. Helgason, Guðmundur. "Ships hit during WWI: Steamer Messidor". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  44. Helgason, Guðmundur. "Ships hit during WWI: Steamer Rutherglen". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  45. Helgason, Guðmundur. "Ships hit during WWI: Steamer Magellan". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  46. Helgason, Guðmundur. "Ships hit during WWI: Sailing vessel Antonio S." German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 3 May 2010.
  47. 1 2 Burt, p. 253, says that Britannia listed 10 degrees within "minutes" of the first explosion, then held that list for 2½ hours before sinking, while Conway's All the World's Fighting Ships 1906–1921, p. 9, claims that she stayed afloat for a total of 3½ hours before sinking, making the length of time it took her to sink ambiguous
  48. 1 2 Helgason, Guðmundur. "Ships hit by UB-50". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 April 2010.

Bibliography