German Type I submarine

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U-25, a Type I U-boat
U-25, a Type I U-boat.
Class overview
Builders: Deschimag, Bremen[1]
Operators:  Kriegsmarine
Preceded by: Spanish Type E1
Cost: 4,500,000 Reichsmark
In commission: 1936–1940
Building: 2
Planned: 2
Completed: 2[1]
Lost: 2[1]
General characteristics [1]
Displacement: 862 t (848 long tons) surfaced
982 t (966 long tons) submerged
Official displacement was 712 tons standard
Length: 72.39 m (237 ft 6 in)
Beam: 6.21 m (20 ft 4 in)
Draft: 4.3 m (14 ft 1 in)
Propulsion: Diesel-electric
2 × MAN M 8 V 40/46 8-cylinder diesel engines with 2,900–3,080 shp (2,160–2,300 kW)
2 × BBC GG UB 720/8 double acting electric motors with 1,000 shp (750 kW)
Speed: 17.7–18.6 kn (32.8–34.4 km/h) surfaced
8.3 kn (15.4 km/h) submerged
Range: 7,900 nautical miles (14,600 km; 9,100 mi) at 10 kn (19 km/h) surfaced
78 nautical miles (144 km; 90 mi) at 4 kn (7.4 km/h) submerged
Test depth: 200 m (660 ft)
Complement: 4 officers, 39 enlisted

The Type I U-boat was the first post–World War I attempt by Nazi Germany's Kriegsmarine to produce an oceangoing submarine. Only two Type IAs were built, but the decision to halt production on further boats is believed to be because of political decisions and not because of major faults in the Type I design. Although the boats did not have any major design faults, they were known to be difficult to handle due to their poor stability and slow dive rate. The type was based on the design of the Finnish Vetehinen class and the Spanish Type E-1,[1] designed by Ingenieurskantoor voor Scheepsbouw (the company also designed the Soviet S class submarine). The design later served as a basis for the development of other types of boats, primarily the VII and IX classes.

Constructed by Deschimag[1] in Bremen, the first Type IA was launched on 14 February 1936. The two boats produced, U-25 and U-26, were primarily used as training vessels and for propaganda purposes to fly the Nazi flag. In 1940, the boats were called into combat duty due to the shortage of available submarines. Both boats experienced short, but successful combat careers. U-25 participated in five war cruises, sinking eight enemy ships. On August 3, 1940, while on a mine laying mission near Norway, U-25 struck a mine and sank with all hands on board.

U-26 carried out eight war cruises, sinking three merchant ships and damaging one British warship on its first mission laying mines. On its second war cruise it became the first U-boat during World War II to enter the Mediterranean Sea. U-26 participated in three other successful war patrols, sinking four additional merchant ships. On its eighth war cruise the boat sunk three merchant ships and damaged another ship the next day. The attack on this ship led to severe depth-charging by two British warships, including HMS Gladiolus.[1] Unable to dive, U-26 was forced to surface where she was bombed by a Sunderland flying boat. The crew scuttled the submarine and were rescued by Allied warships.

List of Type I submarines[edit]

See also[edit]


  1. ^ a b c d e f g Gröner, pp. 66-7.
  • Gröner, Erich (1985). U-Boote, Hilfskreuzer, Minenschiffe, Netzleger, Sperrbrecher. Die deutschen Kriegsschiffe 1815-1945 (in German) III (Koblenz: Bernard & Graefe). ISBN 3-7637-4802-4. 
  • "U-Boat". U-Boat Types – Type IA U-Boat. Retrieved July 31, 2006. 
  • "". U-Boat Types – Type IA. Retrieved July 31, 2006. 
  • Gordon Williamson. Wolf Pack: The Story of the U-Boat in World War II, Osprey Publishing Limited, 2005.