|Ordered:||6 August 1940|
|Laid down:||1 July 1941|
|Launched:||23 May 1942|
|Commissioned:||1 August 1942|
|Fate:||Sunk by Allied warships, northeast of the Azores, April 1944|
|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 four patrols. She sank no ships.
She was a member of ten wolfpacks.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-448 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-448 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 a 2 cm (0.79 in) C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.
The submarine was laid down on 1 July 1941 at Schichau-Werke in Danzig (now Gdansk) as yard number 1508, launched on 23 May 1942 and commissioned on 1 August under the command of Oberleutnant zur See Helmut Dauter.
2nd and 3rd patrols
For her second sortie, she covered the area northwest of the Azores.
On her third foray, she was attacked southwest of Iceland by a Canadian Sunderland flying boat of No. 422 Squadron RCAF. The aircraft was also fired-at on its first run by U-281; the depth charges fell short. The aircraft crashed, five men died. U448 also suffered casualties - one dead and two men wounded. Due to the damage sustained, the boat was compelled to abort the patrol.
4th patrol and loss
Having left St. Nazaire on 14 February 1943, she travelled as far as the Denmark Strait (between Greenland and Iceland). The submarine's fourth sally was, at 61 days, her longest. On 14 April, she was northeast of the Azores when she was sunk by depth charges from the Canadian frigate HMCS Swansea and the British sloop HMS Pelican.
U-448 took part in ten wolfpacks, namely.
- Neptun (18–28 February 1943)
- Wildfang (28 February – 5 March 1943)
- Westmark (6–7 March 1943)
- Amsel (22 April – 3 May 1943)
- Amsel 3 (3–6 May 1943)
- Rhein (7–10 May 1943)
- Elbe 2 (10–14 May 1943)
- Rossbach (24 September – 9 October 1943)
- Schlieffen (14–18 October 1943)
- Preussen (22 February – 14 March 1944)
- 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.
- Kemp, Paul (1999). U-Boats Destroyed - German Submarine Losses in the World Wars. London: Arms & Armour. ISBN 1-85409-515-3.
- Helgason, Guðmundur. "The Type VIIC boat U-448". German U-boats of WWII - uboat.net. Retrieved 26 December 2014.
- Hofmann, Markus. "U 448". Deutsche U-Boote 1935-1945 - u-boot-archiv.de (in German). Retrieved 26 December 2014.