The U-400 is a medium-sized German VIIC submarine from World War II .
|Port of registry||Kiel , Horten , Kristiansand|
|Launching||January 8, 1944|
|Withdrawn from the fleet||December 1944|
|Current status||died on mines|
|Type of ship||average DPL|
|Speed (surface)||17.7 knots|
|Speed (underwater)||7.6 knots|
|Working depth||230 m|
|Immersion depth||250-295 m|
|Autonomy of swimming||15 725 km , 150 km under water|
|Surface displacement||769 t|
|Underwater displacement||871 t|
|The length is the greatest|
(on design basis)
|The width of the body naib.||6.2 m|
(on design basis)
|Diesel-electric, 2 diesel engines MAN M6V 40/46 with a total capacity of 2 800 - 3 200 l. with. at 470-490 rpm.|
|Artillery||C35 88 mm / L45 with 220 charges|
4 bow and one stern TA caliber 533 mm,
|Air defense||2cm Flak 30|
The order for the construction of the submarine was given on August 25, 1941 . The boat was laid down on November 18, 1942 at the Howaldsverke shipyard, Kiel , under building number 32, launched on January 8, 1944 . The boat went into operation on March 18, 1944 under the command of Captain Lieutenant Horst Kreutz.
- March 18, 1944 - October 31, 1944 - 5th Flotilla (training)
- November 1, 1944 - December 15, 1944 - 11th Flotilla
The boat made one military campaign, success was not achieved.
It was supposedly sunk on March 14, 1945, when it was blown up on the British minefield “HW A3” in the area with coordinates off the coast of the Cornwall Peninsula. 50 dead (all crew).
The skeleton of the boat was one of the three skeletons found by amateur divers in 1999-2001. The death of the boat is described in the article by the historian Axel Niestlé “The loss of U 325, U 400 and U 1021”  , published on July 4, 2007.
Before the find, historians believed that the U-400 died on December 17, 1944 in the North Atlantic in the area with coordinates depth charges from the British frigate HMS Nyasaland . In fact, U-772 died in that attack.
- List of submarines of the Third Reich
- Bishop K. Submarines Kriegsmarine. 1939-1945. Reference Guide for Flotillas = Kriegsmarine U-boats 1939-1945. - M .: Eksmo , 2007 .-- 192 p. - (Military equipment of the III Reich). - ISBN 978-5-699-22106-6 .
- Rover Yu. Submarines carrying death. Victories of submarines of Hitler Axis countries = Jürgen Rohwer. Axis submarine successes 1939-1945. - M .: ZAO Tsentrpoligraf Publishing House, 2004. - 416 p. - 2000 copies. - ISBN 5-9524-1237-8 .