List of all U-boats




Ordered2 Feb 1935
Laid down11 Feb 1935 Deutsche Werke AG, Kiel (werk 236)
Launched15 Jun 1935
Commissioned29 Jun 1935Kptlt. Klaus Ewerth
29 Jun 1935 - 30 Sep 1936   Klaus Ewerth
1 Oct 1936 - 2 Feb 1938  Kptlt. Alexander Gelhaar
29 Oct 1938 - 6 Apr 1940  KrvKpt. Jürgen Deecke
2 patrols
1 Jul 1935-1 Sep 1939  U-Bootschulflottille (school boat)
1 Sep 1939-1 Feb 1940  U-Bootschulflottille (school boat)
1 Mar 1940-6 Apr 1940  U-Bootschulflottille (active service)
SuccessesNo ships sunk or damaged

The boat was lost around 6 April 1940 in the North Sea, probably to a British mine in the mine barrage Field No 7. 24 dead (all hands lost). (FDS/NHB, December 1993).

Loss position

View the 2 war patrols

Mine barrage Field No 7 was laid by the destroyers HMS Express, HMS Esk, HMS Icarus and HMS Impulsive in the North Sea on 3 March, 1940. It probably accounted for several U-boats on their inbound or return journey.

Discovery of the wreck
The wreck of U-1 was located by divers in 2007 confirming the loss in mine barrage Field no 7. The entire aft section of the boat was blown off indicating a direct mine hit. See more information and photos here:

Previously recorded fate

  • Sunk on 16 April 1940 in the North Sea southwest of Stavanger, Norway, in position 58.18N, 05.47E, by a torpedo from the British submarine HMS Porpoise. (Postwar assessment)
    Notes. But this attack was against U-3, which escaped unharmed.

Men lost from U-boats

Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-1 did not suffer any casualties (we know of) until the time of her loss.

Media links

U-Boat Operations of the Second World War - Vol 1

Wynn, Kenneth

German U-Boat Losses During World War II

Niestle, Axel

Hitler's U-boat War

Blair, Clay

There was another U-1 in World War One
That boat was launched from its shipyard on 4 Aug 1906 and commissioned into the Imperial Navy on 14 Dec 1906. The Naval war in WWI was brought to an end with the Armistice signed on 11 Nov, 1918. Read about SM U 1 during WWI.