|Ordered:||10 April 1939|
|Laid down:||17 November 1942|
|Launched:||25 June 1943|
|Commissioned:||10 August 1943|
|Fate:||Sunk by US bombs near Hamburg March 1945|
|Class and type:||Type VIIC submarine|
|Height:||9.60 m (31 ft 6 in)|
|Draught:||4.74 m (15 ft 7 in)|
|Complement:||4 officers, 40–56 enlisted|
She carried out six patrols but sank no ships.
She was sunk near Hamburg by US bombs.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-348 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged. She had a total length of 67.10 m (220 ft 2 in), a pressure hull length of 50.50 m (165 ft 8 in), a beam of 6.20 m (20 ft 4 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.74 m (15 ft 7 in). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two AEG GU 460/8–27 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged. She had two shafts and two 1.23 m (4 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).
The submarine had a maximum surface speed of 17.7 knots (32.8 km/h; 20.4 mph) and a maximum submerged speed of 7.6 knots (14.1 km/h; 8.7 mph). When submerged, the boat could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph). U-348 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and two twin 2 cm (0.79 in) C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.
The submarine was laid down on 17 November 1942 at the Nordseewerke yard at Emden as yard number 220, launched on 26 June 1943 and commissioned on 10 August under the command of Oberleutnant zur See Hans-Norbert Schunck*.
U-348 served with the 8th U-boat Flotilla, for training and then with the 9th flotilla for operations from 1 April 1944. She came back under the command of the 8th flotilla on 12 July and was reassigned to the 5th flotilla on 16 February 1945; she stayed with that organization until her destruction on 30 March.
1st, 2nd 3rd patrols
Her first patrol began with her departure from Bergen on 23 April 1944. The detonation of a landmine near Stavanger on 6 May killed one man and wounded another. She returned to Bergen on the 15th.
The submarine's second foray was uneventful.
4th, 5th and 6th patrols
The boat's fourth sortie was divided into three parts in July and August 1944, but kept to the Ostsee (Baltic).
She moved from Swinemünde to Hamburg in February 1945. On 30 March she was destroyed by US bombs during an air-raid.
- Helgason, Guðmundur. "The Type VIIC boat U-348". German U-boats of WWII - uboat.net. Retrieved 25 August 2012.
- Helgason, Guðmundur. "War Patrols by German U-boat U-348". German U-boats of WWII - uboat.net. Retrieved 25 August 2012.
- Gröner 1991, pp. 43-46.
- Busch, Rainer; Röll, Hans-Joachim (1999). German U-boat commanders of World War II : a biographical dictionary. Translated by Brooks, Geoffrey. London, Annapolis, Md: Greenhill Books, Naval Institute Press. ISBN 1-55750-186-6.
- Busch, Rainer; Röll, Hans-Joachim (1999). Deutsche U-Boot-Verluste von September 1939 bis Mai 1945 [German U-boat losses from September 1939 to May 1945]. Der U-Boot-Krieg (in German). IV. Hamburg, Berlin, Bonn: Mittler. ISBN 3-8132-0514-2.
- Gröner, Erich; Jung, Dieter; Maass, Martin (1991). U-boats and Mine Warfare Vessels. German Warships 1815–1945. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
- Helgason, Guðmundur. "The Type VIIC boat U-348". German U-boats of WWII - uboat.net. Retrieved 26 December 2014.
- Hofmann, Markus. "U 348". Deutsche U-Boote 1935-1945 - u-boot-archiv.de (in German). Retrieved 26 December 2014.