|Career (German Empire)|
|Ordered:||15 September 1915|
|Builder:||AG Weser, Bremen|
|Laid down:||8 August 1916|
|Launched:||9 June 1917|
|Commissioned:||15 July 1917|
|Fate:||Rammed and sunk 12 May 1918 by the HMT Olympic. 9 crewmen killed, 31 survived.|
|Class & type:||German Type U 57 submarine|
|Displacement:||808 tons surfaced
946 tons submerged
1160 tons (total)
|Length:||70.60 m (overall)
55.55 m (pressure hull)
|Beam:||6.30 m (overall)
4.15 m (pressure hull)
|Propulsion:||2400 hp surfaced
1200 hp submerged
|Speed:||16.8 knots surfaced
9.1 knots submerged
|Range:||11,220 nautical miles (20,780 km) surfaced
56 nautical miles (104 km) submerged
|Armament:||16 torpedoes (4/2 in bow/stern tubes)
105mm deck gun with 220 rounds
88mm deck gun
|Part of:||Kaiserliche Marine
26 Aug 1917 - 12 May 1918
|Commanders:||Kptlt Claus Rücker
26 Aug 1917 - 12 May 1918
|Victories:||8 merchant ships sunk totalling of 15,462 GRT
1 merchant ship damaged 6,042 GRT
SM U-103 was an Imperial Germany Navy Type U 57 U-boat of the First World War. U-103 was built on AG Weser in Bremen, launched on 9 June 1917 and commissioned 15 July 1917. She completed 5 tours of duty under Kptlt Claus Rücker and sank 8 ships totalling 15,462 gross register tons (GRT).
In the early hours of 12 May 1918, U-103 prepared to launch torpedoes from her stern tubes at RMS Olympic, the sister ship of the ill-fated RMS Titanic, which was en route for France with US troops on board. The crew was unable to flood the two stern torpedo tubes, and the submarine was sighted on the surface by Olympic, whose gunners opened fire as Olympic turned to ram.
U-103 started to crash dive to 30 m (98 ft) and turned to a parallel course, but almost immediately afterwards was struck just aft of her conning tower and Olympic's port propeller sliced through U-103's pressure hull. The crew of U-103 blew her ballast tanks and scuttled and abandoned their sinking submarine. Nine crew members on board lost their lives. Olympic did not stop to pick up the survivors, but continued on to Cherbourg. USS Davis later sighted a distress flare and took 35 survivors to Queenstown.
U-103's wreck lies at position Coordinates: .
Summary of Raiding Career
|12 September 1917||St. Margaret||United Kingdom||943||Sunk|
|12 November 1917||Depute Pierre Goujon||France||4,121||Sunk|
|16 November 1917||Garron Head||United Kingdom||1,933||Sunk|
|26 January 1918||Cork||United Kingdom||1,232||Sunk|
|29 January 1918||Glenfruin||United Kingdom||3,097||Sunk|
|17 March 1918||Cressida||United Kingdom||150||Sunk|
|17 March 1918||Sea Gull||United Kingdom||976||Sunk|
|18 March 1918||Grainton||United Kingdom||6,042||Damaged|
|20 March 1918||Kassanga||United Kingdom||3,015||Sunk|
- "Claus Rücker (Royal House Order of Hohenzollern)". Uboat.net. Retrieved 26 January 2015.
- "U-103". Retrieved 25 January 2010.
- McCartney, Innes; Jak Mallmann-Showell (2002). Lost Patrols: Submarine Wrecks of the English Channel. Periscope Publishing Ltd. p. 36. ISBN 1-904381-04-9.
- Kemp, Paul (1997). U-Boats Destroyed (German submarine losses in the World Wars). London: Arms and Armour Press. p. 49. ISBN 1-85409-321-5.
- "SM U-103 successes". UBoat.net. Retrieved 26 January 2015.