German submarine U-406 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II.She was laid down on 6 September 1940 by Danziger Werft, Danzig as yard number 107, launched on 16 June 1941 and commissioned on 22 October 1941 under Oberleutnant zur See Horst Dietrichs, the ship's only commander.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-406 had a displacement of 769t when at the surface and 871t while submerged. She had a total length of 67.1m (220.1feet), a pressure hull length of 50.5m (165.7feet), a beam of 6.2m (20.3feet), a height of 9.6m (31.5feet), and a draught of 4.74m (15.55feet). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of NaNPS for use while surfaced, two Siemens-Schuckert GU 343/38–8 double-acting electric motors producing a total of 750PS for use while submerged. She had two shafts and two 1.23abbr=onNaNabbr=on propellers. The boat was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . U-406 was fitted with five 53.30NaN0 torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.82NaN2 SK C/35 naval gun, 220 rounds, and a 2sp=usNaNsp=us C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.
The boat's career began with training at 8th U-boat Flotilla on 22 October 1941, followed by active service on 1 May 1942 as part of the 7th Flotilla for the remainder of her service.
She was attacked by a torpedo from a British Submarine on 5 May 1942, but the torpedo missed.
During the attack of Convoy ON 92 on May 11 and May 12, 1942, U-406 would suffer from torpedo launch failures on two separate occasions thus failing to hit any ship.
On 5 May 1943, the boat collided with U-600, causing heavy damage to both ships and required a premature return to base in Saint Nazaire, France.
In eight patrols she sank one merchant ship, for a total of, and damaged three merchant ships for a total of .
U-406 took part in eleven wolfpacks:
U-406 was sunk on 18 February 1944 in the North Atlantic in position 48.5333°N -59°W, by depth charges from Royal Navy frigate . Twelve of the crew were killed, while 45 survived.
| Date | Ship Name | Nationality | Tonnage (GRT) | Fate[1] | |
|---|---|---|---|---|---|
| 19 August 1942 | City of Manila |  United Kingdom | 7,452 | Sunk | |
| 28 December 1942 | Baron Cochrane | United Kingdom | 3,385 | Damaged | |
| 28 December 1942 | Lynton Grange | United Kingdom | 5,029 | Damaged | |
| 28 December 1942 | Zarian | United Kingdom | 4,871 | Damaged |
U-406 is mentioned in Wolfpack, a song released by the Power metal band Sabaton in their 2005 debut studio album Primo Victoria.