View source for SM U-33 (Germany)

{{other ships|German submarine U-33}}
{{Use dmy dates|date=July 2015}}
{|{{Infobox ship begin}}
{{Infobox ship image
|Ship image=
|Ship caption=
}}
{{Infobox ship career
|Hide header=
|Ship country=[[German Empire]]
|Ship flag={{Shipboxflag|German Empire|naval}}
|Ship name=''U-33''
|Ship ordered=29 March 1912 
|Ship builder=[[Germaniawerft]], [[Kiel]]
|Ship original cost=
|Ship yard number=193
|Ship laid down=7 November 1912 
|Ship launched=19 May 1914 
|Ship commissioned=27 September 1914 
|Ship fate=Surrendered at the end of the war broken up at [[Blyth, Northumberland|Blyth]] in 1919-20
}}
{{Infobox ship characteristics
|Hide header=
|Header caption=
|Ship class=[[Type U 31 submarine]]
|Ship displacement=
*{{convert|685|t|LT|abbr=on|lk=on}} (surfaced)
*{{convert|878|t|LT|abbr=on}} (submerged)
|Ship length=
*{{convert|64.70|m|ftin|abbr=on}} ([[o/a]])
*{{convert|52.36|m|ftin|abbr=on}} ([[pressure hull]])
|Ship beam=
*{{convert|6.32|m|ftin|abbr=on}} (o/a)
*{{convert|4.05|m|ftin|abbr=on}} (pressure hull)
|Ship height=
|Ship draught={{convert|3.56|m|ftin|abbr=on}}
|Ship power=
*2 × {{convert|1850|PS|kW shp|abbr=on|lk=on|0}} [[diesel engine]]s
*2 × {{convert|1200|PS|kW shp|abbr=on|0}} [[Motor-generator|Doppelmodyn]]
|Ship propulsion=
*2 × shafts
*2 × {{convert|1.60|m|ftin|abbr=on}} propellers
|Ship speed=
*{{convert|16.4|kn|lk=in}} (surfaced)
*{{convert|9.7|kn}} (submerged)
|Ship range=
*{{convert|8790|nmi|lk=in|abbr=on}} at {{convert|8|kn}} (surfaced)
*{{convert|80|nmi|abbr=on}} at {{convert|5|kn}} (submerged)
|Ship test depth={{convert|50|m|ftin|abbr=on}}
|Ship boats=
|Ship complement=4 officers, 31 enlisted
|Ship armament=
*four {{convert|50|cm|in|adj=on|abbr=on}} [[torpedo tube]]s (2 each bow and stern)
*6 [[torpedo]]es
*one [[8.8 cm SK L/30 naval gun|{{convert|8.8|cm|in|sp=us|abbr=on}} SK L/30]] [[deck gun]] [[10.5 cm SK L/45 naval gun|{{convert|10.5|cm|in|sp=us|abbr=on}} SK L/45]] from 1916)
|Ship notes=
}}
{{Infobox service record
|is_ship=yes
|label= 
|partof=* IV Flotilla
* Unknown start - 1 August 1915
* Pola Flotilla
* 16 September 1915 - 11 March 1916
* Constantinople Flotilla
* 11 March - 27 Nov 1916
* Pola / Mittelmeer / Mittelmeer I Flotilla
* 27 November 1916 - 11 November 1918
|codes=
|commanders=*Konrad Gansser<ref name="uboat.net">{{cite Uboat.net
|id=33
|name=U 33
|type=1sub
 |accessdate = 29 August 2009
}}</ref>
*27 September 1914 – 31 March 1917
*Gustav Sieß<ref name="uboat.net"/>
*1 April 1917 – 11 November 1918
|operations= 16 patrols
|victories=
*82 merchant ships sunk <br>({{GRT|188,331}})
*2 auxiliary warship sunk <br>({{GRT|5,800}})
*8 merchant ships damaged <br>({{GRT|36,452}})
*1 merchant ship taken as prize<br>({{GRT|453}})
}}
|}

'''SM ''U-33''''' was a German [[Type U 31 submarine|Type U 31]] [[U-boat]] of the [[Imperial German Navy]].

==Design==
[[Type U 31 submarine]]s were [[Double hull#Submarines|double-hulled]] ocean-going craft similar to [[Type U 23 submarine|Type 23]] and [[Type U 27 submarine|Type 27]] boats in dimensions, differing only slightly in propulsion and speed. They were considered very good high sea boats with average manoeuvrability and good surface steering.{{sfn|Gröner|1991|p=6}}

''U-33'' had an [[length overall|overall length]] of {{convert|64.70|m|ftin|abbr=on}}, her [[pressure hull]] was {{convert|52.36|m|ftin|abbr=on}} long. The boat's [[Beam (nautical)|beam]] was {{convert|6.32|m|ftin|abbr=on}} (o/a), while the pressure hull measured {{convert|4.05|m|ftin|abbr=on}}. Type 31s had a [[draft (hull)|draught]] of {{convert|3.56|m|ftin|abbr=on}} with a total height of {{convert|7.68|-|8.04|m|ftin|abbr=on}}. The boats [[Displacement (ship)|displaced]] a total of {{convert|971|t|LT}}; {{convert|685|t|LT|abbr=on}} when surfaced and {{convert|878|t|LT|abbr=on}} when submerged.{{sfn|Gröner|1991|p=6}}

''U-33'' was fitted with two [[Germaniawerft|Germania]] 6-cylinder two-stroke [[diesel engine]]s with a total of {{convert|1850|PS|kW bhp|0|lk=on}} for use on the surface and two [[Siemens-Schuckert]] double-acting [[Motor–generator|electric motors]] with a total of {{convert|1200|PS|kW shp|0|abbr=on}} for underwater use. These engines powered two shafts, each with a {{convert|1.60|m|ftin|abbr=on}} [[propeller]], which gave the boat a top surface speed of {{convert|16.4|kn|lk=in}}, and {{convert|9.7|kn}} when submerged. Cruising range was {{convert|8790|nmi|lk=in}} at {{convert|8|kn}} on the surface, and {{convert|80|nmi|abbr=on}} at {{convert|5|kn}} under water. Diving depth was {{convert|50|m|ftin|abbr=on}}.{{sfn|Gröner|1991|p=6}}

The U-boat was armed with four {{convert|50|cm|in|adj=on|abbr=on}} [[torpedo tube]]s, two fitted in the [[Bow (ship)|bow]] and two in the [[stern]], and carried six [[torpedo]]es. Additionally ''U-33'' was equipped in 1915 with one [[8.8 cm SK L/30 naval gun|{{convert|8.8|cm|in|sp=us|abbr=on}} Uk L/30]] [[deck gun]], which was later replaced with a {{convert|10.5|cm|in|abbr=on}} gun. The boat's [[Ship's company|complement]] was four officers and 31 enlisted.{{sfn|Gröner|1991|p=6}}

==Service history==

===SS ''Brussels''===
On 28 March 1915, ''U-33'' ordered the [[Great Eastern Railway|Great Eastern Railway's]] {{SS|Brussels}} to stop.<ref name=Fryatt>{{cite web |url=http://www.southernlife.org.uk/fryatt.htm |title=Charles Fryatt |publisher=Southern Life |access-date=4 December 2009 |url-status=dead |archive-url=https://web.archive.org/web/20081006185254/http://southernlife.org.uk/fryatt.htm |archive-date=6 October 2008 |df=dmy-all }}</ref> Instead of doing so, her captain, [[Charles Fryatt]], ordered full steam ahead and attempted to ram ''U-33'', which only just managed to dive in time.<ref name=GEM0916>[http://www.york.ac.uk/inst/irs/irshome/features/readings/readings.htm#EX02 ''The Great Eastern Railway Magazine'', September 1916, p218-26]</ref>

===Sinking of hospital ship===

On 30 March,<ref name=NYT1916>{{cite news | url=https://timesmachine.nytimes.com/timesmachine/1916/04/05/100200115.pdf | title=Sinking of Portugal branded as piracy | date=5 April 1916 | newspaper=The New York Times | accessdate=7 September 2019 }}</ref> 1916 the [[Russia]]n [[hospital ship]] [[Russian hospital ship Portugal|''Portugal'']] was towing a string of small flat-bottomed boats to ferry wounded from the shore to the ship. Off [[Rize Province|Rizeh]], on the Turkish coast of the [[Black Sea]] she had stopped as one of the small boats was sinking and repairs were being made. The ship was not carrying wounded at the time, but had a staff of [[Red Cross]] workers on board, as well as her usual crew.<ref name="waronhospitalshi00lond">{{cite book | title = The War on hospital ships, from the narratives of eye-witnesses (1917)|year= 1917|edition= 1917|page= 1| publisher = London : T. Fisher Unwin|url=https://archive.org/details/waronhospitalshi00lond  }} - Call number: SRLF_UCLA:LAGE-3563453</ref>
| The ship's crew saw a [[periscope]] approaching the vessel but as the ship was a hospital ship and protected by the [[Hague Conventions (1899 and 1907)|Hague conventions]] no evasive actions were taken. Without warning SM ''U-33'' fired a [[torpedo]] which missed. The submarine came around again fired a torpedo from a depth of 30 feet, which hit near the engine room, breaking the ship into two pieces.<ref name="waronhospitalshi00lond"/> Of 273 persons on board, 158 were rescued.<ref name=NYT1916 />

==Operations==


<!-- If you want to add a correction or a comment, please use the footnotes. Thanks.         -->
<!-- My sources - Wright or Wrong...                                                         -->

''SM U-33'' ''Kptlt.'' Gausser until Autumn 1917, then to ''U-156''; next C.O. probably ''Kptlt.'' Siess. 

U-33 came off the stocks at Kiel about the end of November 1914, and joined the Kiel School for trials before proceeding to [[Emden]] on 12 January 1915. She was attached to the 4th Half Flotilla.<ref name="Arch">[http://www.nationalarchives.gov.uk/catalogue/displaycataloguedetails.asp?CATLN=6&CATID=3981615&j=1 National Archives, Kew: HW 7/3, Room 40, History of German Naval Warfare 1914-1918] (Published below - Room 40: German Naval Warfare 1914-1918)</ref> 24–25 January 1915, it was on patrol in the Bight, an area where enemy battlecruisers were reported.<ref name=Arch/> On 30 January 1915, departed on "Special anti-submarine patrol" but returned owing to engine trouble.<ref name="Arch" />

Further patrols in Bight were made on 18–20 February  and 21-22 February 1915l.<ref name="Arch" />

From 27 February – 10 April 1915 U-33 passed through the English Channel and into the Atlantic. 2 S.S., 2 sailing vessels sunk.<ref name="Arch" />

29–30 May 1915. North Sea returned owing to defective W/T.<ref name=Arch/>

4–24 June 1915. Northabout to west coast of Scotland. Sank 2 S.S., 1 prize.<ref name=Arch/>

14–17 August 1915. Bight Anti-air raid patrol.<ref name=Arch/>

28 August – 15 September 1915. To Mediterranean northabout. Sank 5 S.S. 

Arrived [[Cattaro]] about 15 September and joined the [[Constantinople Flotilla|Constantinople Half Flotilla]].<ref name="Arch" />

28 September – 9 October 1915. Cruise in eastern Mediterranean. Sank 10 S.S.<ref name=Arch/>

16 November – 6 December 1915. Cruise in central Mediterranean. Sank 13 S.S. On 5 December was in action with drifter ''HOLLIBANK'' in the [[Strait of Otranto|Straits of Otranto]]. Intercepted a neutral Greek ship between [[Piraeus]] and [[Messina]] and took as prisoner [[Stanley Wilson (British politician)|Stanley Wilson]], a King's messenger.<ref name=Arch/>

April 1916 – November 1916. ''U-33'' was operating chiefly in the eastern Black Sea and was based on Constantinople or Varna. By April 1917 she was back in the Adriatic.<ref name=Arch/>

12 January – 10 February 1918. Left Cattaro and operated in eastern Mediterranean. Sank 2. S.S., 2 sailing vessels, and damaged but did not sink 2 S.S.<ref name=Arch/>

1–17 May 1918. Left Cattaro for the east, and on 7 May was in area off Port Said. Sank 1 S.S., 1 sailing vessel, and attacked 2 ships and a convoy unsuccessfully. On May 8 was in action, and on 15 May broke off undertaking owing to defects.<ref name=Arch/>

2 September to about 26 September. Left Cattaro for the east. Sank 1 S.S., 12 sailing vessels.<ref name=Arch/>

On 19 October 1918. ''U-33'' left Cattaro for Kiel en route attacked by a [[naval trawler]] on 1 November at about 36°35'E. She steered northabout and by the Sound, at some time with ''UB-51'' and ''UB-105''.<ref name=Arch/> At the end of the war, U-33 was surrendered to British at Harwich January 16, 1919.<ref name="Arch" />

==Summary of raiding history==
{| class="wikitable sortable"
|-
! width="140px"|Date
! width="140px"|Name
! width="160px"|Nationality
! width="25px" |Tonnage<ref group=Note name=tonnage>Merchant ship tonnages are in [[gross register tons]]. Military vessels are listed by tons [[displacement (ship)|displacement]].</ref>
! width="160px"|Fate<ref>{{cite Uboat.net
|id=u33
|name=U 33
|type=1boat
|accessdate=16 December 2014
}}</ref>
|-
|align="right"|2 April 1915
|align="left" |[[List of shipwrecks in April 1915#2 April|''Paquerette'']]
|align="left" |{{flag|France}}
|align="right"|399
|align="left" |Sunk
|-
|align="right"|4 April 1915
|align="left" |[[List of shipwrecks in April 1915#4 April|''Hermes'']]
|align="left" |{{flag|Russian Empire}}
|align="right"|1,019
|align="left" |Sunk
|-
|align="right"|4 April 1915
|align="left" |[[List of shipwrecks in April 1915#4 April|''Olivine'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|634
|align="left" |Sunk
|-
|align="right"|5 April 1915
|align="left" |[[List of shipwrecks in April 1915#5 April|''Northlands'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|2,776
|align="left" |Sunk
|-
|align="right"|10 June 1915
|align="left" |[[List of shipwrecks in June 1915#10 June|''Dania'']]
|align="left" |{{flag|Russian Empire}}
|align="right"|2,648
|align="left" |Sunk
|-
|align="right"|14 June 1915
|align="left" |[[List of shipwrecks in June 1915#14 June|''Davanger'']]
|align="left" |{{flag|Norway}}
|align="right"|2,256
|align="left" |Sunk
|-
|align="right"|21 June 1915
|align="left" |[[List of shipwrecks in June 1915#21 June|''Sigurd Hund'']]
|align="left" |{{flag|Norway}}
|align="right"|453
|align="left" |Captured as prize
|-
|align="right"|1 September 1915
|align="left" |[[List of shipwrecks in September 1915#1 September|''Whitefield'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|2,422
|align="left" |Sunk
|-
|align="right"|4 September 1915
|align="left" |[[List of shipwrecks in September 1915#4 September|''Cymbeline'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|4,505
|align="left" |Sunk
|-
|align="right"|4 September 1915
|align="left" |[[List of shipwrecks in September 1915#4 September|''Glimt'']]
|align="left" |{{flag|Norway}}
|align="right"|955
|align="left" |Sunk
|-
|align="right"|4 September 1915
|align="left" |[[List of shipwrecks in September 1915#4 September|''Mimosa'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,466
|align="left" |Sunk
|-
|align="right"|4 September 1915
|align="left" |[[List of shipwrecks in September 1915#4 September|''Storesand'']]
|align="left" |{{flag|Norway}}
|align="right"|1,639
|align="left" |Sunk
|-
|align="right"|6 September 1915
|align="left" |[[List of shipwrecks in September 1915#6 September|''John Hardie'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|4,372
|align="left" |Sunk
|-
|align="right"|30 September 1915
|align="left" |[[List of shipwrecks in September 1915#30 September|''Tobia'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|185
|align="left" |Sunk
|-
|align="right"|1 October 1915
|align="left" |[[List of shipwrecks in October 1915#1 October|''Provincia'']]
|align="left" |{{flag|France}}
|align="right"|3,523
|align="left" |Sunk
|-
|align="right"|2 October 1915
|align="left" |[[List of shipwrecks in October 1915#2 October|''Arabian'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|2,744
|align="left" |Sunk
|-
|align="right"|2 October 1915
|align="left" |[[List of shipwrecks in October 1915#2 October|''Sainte Marguerite'']]
|align="left" |{{flag|France}}
|align="right"|3,908
|align="left" |Sunk
|-
|align="right"|3 October 1915
|align="left" |[[List of shipwrecks in October 1915#3 October|''Antonie'']]
|align="left" |{{flag|France}}
|align="right"|2,698
|align="left" |Sunk
|-
|align="right"|4 October 1915
|align="left" |[[List of shipwrecks in October 1915#4 October|''Craigston'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|2,617
|align="left" |Sunk
|-
|align="right"|4 October 1915
|align="left" |[[List of shipwrecks in October 1915#4 October|''Yunnan'']]
|align="left" |{{flag|France}}
|align="right"|6,474
|align="left" |Damaged
|-
|align="right"|5 October 1915
|align="left" |[[List of shipwrecks in October 1915#5 October|''Burrsfield'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|4,037
|align="left" |Sunk
|-
|align="right"|5 October 1915
|align="left" |[[List of shipwrecks in October 1915#5 October|''X130'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|160
|align="left" |Sunk
|-
|align="right"|6 October 1915
|align="left" |[[List of shipwrecks in October 1915#6 October|''Dimitrios'']]
|align="left" |{{flag|Greece|old}}
|align="right"|2,508
|align="left" |Sunk
|-
|align="right"|6 October 1915
|align="left" |[[List of shipwrecks in October 1915#6 October|''Scawby'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,658
|align="left" |Sunk
|-
|align="right"|6 October 1915
|align="left" |[[List of shipwrecks in October 1915#6 October|''Silverash'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,753
|align="left" |Sunk
|-
|align="right"|7 October 1915
|align="left" |[[List of shipwrecks in October 1915#7 October|''Amiral Hamelin'']]
|align="left" |{{flag|France}}
|align="right"|5,051
|align="left" |Sunk
|-
|align="right"|18 November 1915
|align="left" |[[List of shipwrecks in November 1915#18 November|''Enosis'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,409
|align="left" |Sunk
|-
|align="right"|19 November 1915
|align="left" |[[List of shipwrecks in November 1915#19 November|''Senju Maru'']]
|align="left" |{{flag|Japan}}
|align="right"|4,340
|align="left" |Sunk
|-
|align="right"|20 November 1915
|align="left" |[[List of shipwrecks in November 1915#20 November|''Merganser'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|1,905
|align="left" |Sunk
|-
|align="right"|23 November 1915
|align="left" |[[List of shipwrecks in November 1915#23 November|''Tafna'']]
|align="left" |{{flag|France}}
|align="right"|1,444
|align="left" |Damaged
|-
|align="right"|24 November 1915
|align="left" |[[List of shipwrecks in November 1915#24 November|''Liguria'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|3,199
|align="left" |Sunk
|-
|align="right"|25 November 1915
|align="left" |[[List of shipwrecks in November 1915#25 November|''Algerien'']]
|align="left" |{{flag|France}}
|align="right"|1,767
|align="left" |Sunk
|-
|align="right"|26 November 1915
|align="left" |[[List of shipwrecks in November 1915#26 November|''Tringa'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|2,154
|align="left" |Sunk
|-
|align="right"|27 November 1915
|align="left" |[[List of shipwrecks in November 1915#27 November|''Kingsway'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,647
|align="left" |Sunk
|-
|align="right"|27 November 1915
|align="left" |[[List of shipwrecks in November 1915#27 November|''Omara'']]
|align="left" |{{flag|France}}
|align="right"|435
|align="left" |Sunk
|-
|align="right"|27 November 1915
|align="left" |[[List of shipwrecks in November 1915#27 November|''Tanis'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,655
|align="left" |Sunk
|-
|align="right"|29 November 1915
|align="left" |[[List of shipwrecks in November 1915#29 November|''Malinche'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|1,868
|align="left" |Sunk
|-
|align="right"|29 November 1915
|align="left" |[[List of shipwrecks in November 1915#29 November|''Zarifis'']]
|align="left" |{{flag|Greece|old}}
|align="right"|2,904
|align="left" |Sunk
|-
|align="right"|30 November 1915
|align="left" |[[List of shipwrecks in November 1915#30 November|''Colenso'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,861
|align="left" |Sunk
|-
|align="right"|30 November 1915
|align="left" |[[List of shipwrecks in November 1915#30 November|''Langton Hall'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|4,437
|align="left" |Sunk
|-
|align="right"|1 December 1915
|align="left" |[[List of shipwrecks in December 1915#1 December|''Clan Macleod'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|4,796
|align="left" |Sunk
|-
|align="right"|1 December 1915
|align="left" |[[List of shipwrecks in December 1915#1 December|''Umeta'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|5,312
|align="left" |Sunk
|-
|align="right"|2 December 1915
|align="left" |[[List of shipwrecks in December 1915#2 December|''Commodore'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|5,858
|align="left" |Sunk
|-
|align="right"|30 March 1916
|align="left" |[[Russian hospital ship Portugal|''Portugal'']]
|align="left" |{{navy|Russian Empire}}
|align="right"|5,358
|align="left" |Sunk
|-
|align="right"|31 March 1916
|align="left" |[[List of shipwrecks in March 1916#31 March|''Roi Albert'']]
|align="left" |{{flag|Belgium}}
|align="right"|2,853
|align="left" |Damaged
|-
|align="right"|31 March 1916
|align="left" |[[List of shipwrecks in March 1916#31 March|''Unidentified Sailing Vessel'']]
|align="left" |{{flag|Russian Empire}}
|align="right"|7
|align="left" |Sunk
|-
|align="right"|3 April 1916
|align="left" |[[List of shipwrecks in April 1916#3 April|''Enrichetta'']]
|align="left" |{{navy|Russian Empire}}
|align="right"|442
|align="left" |Sunk
|-
|align="right"|28 April 1916
|align="left" |[[List of shipwrecks in April 1916#28 April|''Lyusya'']]
|align="left" |{{flag|Russian Empire}}
|align="right"|50
|align="left" |Sunk
|-
|align="right"|28 April 1916
|align="left" |[[List of shipwrecks in April 1916#28 April|''Anzhelika'']]
|align="left" |{{flag|Russian Empire}}
|align="right"|170
|align="left" |Sunk
|-
|align="right"|28 April 1916
|align="left" |[[List of shipwrecks in April 1916#28 April|''Unidentified sailing vessel'']]
|align="left" |{{flag|Russian Empire}}
|align="right"|300
|align="left" |Sunk
|-
|align="right"|18 September 1916
|align="left" |[[List of shipwrecks in September 1916#18 September|''Unidentified Small Fishing Vessel (1 of 2)'']]
|align="left" |{{flag|Russian Empire}}
|align="left" |unknown
|align="left" |Sunk
|-
|align="right"|18 September 1916
|align="left" |[[List of shipwrecks in September 1916#18 September|''Unidentified Small Fishing Vessel (2 of 2)'']]
|align="left" |{{flag|Russian Empire}}
|align="left" |unknown
|align="left" |Sunk
|-
|align="right"|15 April 1917
|align="left" |[[List of shipwrecks in April 1917#15 April|''Cameronia'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|10,963
|align="left" |Sunk
|-
|align="right"|16 April 1917
|align="left" |[[List of shipwrecks in April 1917#16 April|''Sontay'']]
|align="left" |{{flag|France}}
|align="right"|7,247
|align="left" |Sunk
|-
|align="right"|22 April 1917
|align="left" |[[List of shipwrecks in April 1917#22 April|''Blaatind'']]
|align="left" |{{flag|Norway}}
|align="right"|1,641
|align="left" |Sunk
|-
|align="right"|22 April 1917
|align="left" |[[List of shipwrecks in April 1917#22 April|''Maria S.'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|133
|align="left" |Sunk
|-
|align="right"|22 April 1917
|align="left" |[[List of shipwrecks in April 1917#22 April|''Unione'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|207
|align="left" |Sunk
|-
|align="right"|26 April 1917
|align="left" |[[List of shipwrecks in April 1917#26 April|''Monitor'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|138
|align="left" |Sunk
|-
|align="right"|27 April 1917
|align="left" |[[List of shipwrecks in April 1917#27 April|''Mafalda'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|162
|align="left" |Sunk
|-
|align="right"|27 April 1917
|align="left" |[[List of shipwrecks in April 1917#27 April|''Margaret B. Rouss'']]
|align="left" |{{flag|United States|1912}}
|align="right"|701
|align="left" |Sunk
|-
|align="right"|28 April 1917
|align="left" |[[List of shipwrecks in April 1917#28 April|''Lisetta'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|40
|align="left" |Sunk
|-
|align="right"|30 April 1917
|align="left" |[[List of shipwrecks in April 1917#30 April|''Chrisomalli Th. Sifneo'']]
|align="left" |{{flag|Greece|old}}
|align="right"|2,415
|align="left" |Sunk
|-
|align="right"|27 May 1917
|align="left" |[[List of shipwrecks in May 1917#27 May|''Beatrice'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|106
|align="left" |Sunk
|-
|align="right"|27 May 1917
|align="left" |[[List of shipwrecks in May 1917#27 May|''Michele Costantino'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|51
|align="left" |Sunk
|-
|align="right"|3 June 1917
|align="left" |[[List of shipwrecks in June 1917#3 June|''Greenbank'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,881
|align="left" |Sunk
|-
|align="right"|3 June 1917
|align="left" |[[List of shipwrecks in June 1917#3 June|''Islandmore'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,046
|align="left" |Sunk
|-
|align="right"|7 June 1917
|align="left" |[[List of shipwrecks in June 1917#7 June|''Il Dionisio'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|97
|align="left" |Sunk
|-
|align="right"|7 June 1917
|align="left" |[[List of shipwrecks in June 1917#7 June|''San Antonio'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|13
|align="left" |Sunk
|-
|align="right"|26 July 1917
|align="left" |[[List of shipwrecks in July 1917#26 July|''Blanchette'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|280
|align="left" |Sunk
|-
|align="right"|26 July 1917
|align="left" |[[List of shipwrecks in July 1917#26 July|''Gesu E Maria'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|196
|align="left" |Sunk
|-
|align="right"|27 July 1917
|align="left" |[[List of shipwrecks in July 1917#27 July|''Frigido'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|59
|align="left" |Sunk
|-
|align="right"|27 July 1917
|align="left" |[[List of shipwrecks in July 1917#27 July|''Genova'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|3,486
|align="left" |Sunk
|-
|align="right"|28 July 1917
|align="left" |[[List of shipwrecks in July 1917#28 July|''Splendor'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|6,507
|align="left" |Damaged
|-
|align="right"|1 August 1917
|align="left" |[[List of shipwrecks in August 1917#1 August|''Llandudno'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|4,187
|align="left" |Sunk
|-
|align="right"|4 August 1917
|align="left" |[[List of shipwrecks in August 1917#4 August|''Angelina T.'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|146
|align="left" |Sunk
|-
|align="right"|8 August 1917
|align="left" |[[List of shipwrecks in August 1917#8 August|''Llanishen'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,837
|align="left" |Sunk
|-
|align="right"|9 August 1917
|align="left" |[[List of shipwrecks in August 1917#9 August|''Flora'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|125
|align="left" |Sunk
|-
|align="right"|9 August 1917
|align="left" |[[List of shipwrecks in August 1917#9 August|''Industria'']]
|align="left" |{{flag|Spain}}
|align="right"|51
|align="left" |Sunk
|-
|align="right"|15 August 1917
|align="left" |[[List of shipwrecks in August 1917#15 August|''Bandai Maru'']]
|align="left" |{{flag|Japan}}
|align="right"|3,227
|align="left" |Sunk
|-
|align="right"|23 January 1918
|align="left" |[[List of shipwrecks in January 1918#23 January|''Capri'']]
|align="left" |{{flag|Kingdom of Italy}}
|align="right"|3,899
|align="left" |Damaged
|-
|align="right"|24 January 1918
|align="left" |[[List of shipwrecks in January 1918#24 January|''Antonios J. Dracoulis'']]
|align="left" |{{flag|Greece|old}}
|align="right"|3,301
|align="left" |Sunk
|-
|align="right"|25 January 1918
|align="left" |[[List of shipwrecks in January 1918#25 January|''Apostoles Andreas'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|50
|align="left" |Sunk
|-
|align="right"|29 January 1918
|align="left" |[[List of shipwrecks in January 1918#29 January|''Taxiarchis'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|160
|align="left" |Sunk
|-
|align="right"|31 January 1918
|align="left" |[[List of shipwrecks in January 1918#31 January|''Eggesford'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|4,414
|align="left" |Damaged
|-
|align="right"|1 February 1918
|align="left" |[[List of shipwrecks in February 1918#1 February|''Glenamoy'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|7,269
|align="left" |Damaged
|-
|align="right"|4 February 1918
|align="left" |[[List of shipwrecks in February 1918#4 February|''Ravenshoe'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,592
|align="left" |Damaged
|-
|align="right"|4 February 1918
|align="left" |[[List of shipwrecks in February 1918#4 February|''Standish Hall'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,996
|align="left" |Sunk
|-
|align="right"|20 March 1918
|align="left" |[[List of shipwrecks in March 1918#20 March|''Saint Dimitrios'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|3,359
|align="left" |Sunk
|-
|align="right"|20 March 1918
|align="left" |[[List of shipwrecks in March 1918#20 March|''Samoset'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|5,251
|align="left" |Sunk
|-
|align="right"|20 March 1918
|align="left" |[[List of shipwrecks in March 1918#20 March|''Yochow'']]
|align="left" |{{flag|United Kingdom|civil}}
|align="right"|2,127
|align="left" |Sunk
|-
|align="right"|20 March 1918
|align="left" |[[List of shipwrecks in March 1918#20 March|''Antonios M. Theophilatos'']]
|align="left" |{{flag|Greece|old}}
|align="right"|2,282
|align="left" |Sunk
|-
|align="right"|31 March 1918
|align="left" |[[List of shipwrecks in March 1918#31 March|''La Loire'']]
|align="left" |{{flag|France}}
|align="right"|5,343
|align="left" |Sunk
|-
|align="right"|5 May 1918
|align="left" |[[List of shipwrecks in May 1918#5 May|''Aghios Johannis'']]
|align="left" |{{flag|Greece|old}}
|align="right"|20
|align="left" |Sunk
|}

== See also ==
*[[Room 40]]

==References==

===Notes===
{{Reflist|group=Note}}

===Citations===
{{Reflist}}

==Bibliography==
*{{cite book
|last1=Gröner
|first1=Erich
|last2=Jung
|first2=Dieter
|last3=Maass
|first3=Martin
|translator-last1=Thomas
|translator-first1=Keith
|translator-last2=Magowan
|translator-first2=Rachel
|year=1991
|title=U-boats and Mine Warfare Vessels
|volume=2
|series=German Warships 1815–1945
|location=London
|publisher=Conway Maritime Press
|isbn=0-85177-593-4
|ref=CITEREFGröner1991
}}
*{{cite book |title=Der Handelskrieg mit U-Booten. 5 Vols |last=Spindler |first=Arno |orig-year=1932|year=1966|publisher= Mittler & Sohn. Vols. 4+5, dealing with 1917+18, are very hard to find: [[Guildhall Library]], London, has them all, also Vol. 1-3 in an English translation: The submarine war against commerce|location=Berlin }}
*{{cite book |title=Room 40: British Naval Intelligence 1914-1918|last=Beesly |first=Patrick |year=1982 |publisher= H Hamilton |location=London |isbn=978-0-241-10864-2 }}
*{{cite book |title=A Naval History of World War I|last=Halpern |first=Paul G. |year=1933 |publisher=Routledge |location=New York |isbn=978-1-85728-498-0 }}
*{{cite book |title=Die Unterseeboote der Kaiserlichen Marine |last=Roessler |first=Eberhard |year=1997 |publisher= Bernard & Graefe |location=Bonn |isbn=978-3-7637-5963-7 }}
*{{cite book |title=Die U-Boote des Kaisers |last=Schroeder |first=Joachim |year=2002 |publisher= Bernard & Graefe |location=Bonn |isbn=978-3-7637-6235-4  }}
*{{cite book |title=Room 40: German Naval Warfare 1914-1918. Vol I., The Fleet in Action|last=Koerver |first=Hans Joachim |year=2008 |publisher=LIS Reinisch |location=Steinbach |isbn=978-3-902433-76-3 }}
*{{cite book |title=Room 40: German Naval Warfare 1914-1918. Vol II., The Fleet in Being|last=Koerver |first=Hans Joachim |year=2009 |publisher=LIS Reinisch |location=Steinbach |isbn=978-3-902433-77-0 }}

==External links==
*[http://www.u54.suedholland-ferienhaus.de/html/s_m__u_54.html Photos of cruises of German submarine U-54 in 1916-1918.] Great photo quality, comments in German.
*[https://web.archive.org/web/20091130023342/http://www.europafilmtreasures.eu/PY/269/see-the-film-the_enchanted_circle A 44 min. film from 1917 about a cruise of the German submarine U-35.] A German propaganda film without dead or wounded; many details about submarine warfare in World War I.
*{{cite Uboat.net
|id=33
|name=U 33
|type=1sub
}}
*[http://germannavalwarfare.info/indexbr.htm Room 40:] {{Webarchive|url=https://web.archive.org/web/20181015003000/http://germannavalwarfare.info/indexbr.htm |date=15 October 2018 }} original documents, photos and maps about World War I German submarine warfare and British [[Room 40]] Intelligence from [[The National Archives]], Kew, Richmond, UK.

{{German Type U 31 submarines}}

{{DEFAULTSORT:U0032}}
[[Category:German Type U 31 submarines]]
[[Category:U-boats commissioned in 1914]]
[[Category:World War I submarines of Germany]]
[[Category:1914 ships]]
[[Category:Ships built in Kiel]]