List of all U-boats




Ordered5 Jun 1941
Laid down24 Jan 1942 Flender Werke AG, Lübeck (werk 309)
Launched5 Dec 1942
Commissioned27 Jan 1943Oblt. Hans-Gert Mahrholz
27 Jan 1943 - Aug, 1944  Oblt. Hans-Gert Mahrholz (German Cross in Gold)
Aug, 1944 - 16 Feb 1945  Oblt. Herbert Loeder
9 patrols
27 Jan 1943-31 Jul 1943  8. Flottille (training)
1 Aug 1943-31 Oct 1943  11. Flottille (active service)
1 Nov 1943-1 Oct 1944  9. Flottille (active service)
1 Oct 1944-16 Feb 1945  33. Flottille (active service)
Successes1 ship a total loss, total tonnage 7,219 GRT

Sunk on 16 February 1945 in the North Sea east of Moray Firth, in position 58.09N, 02.23W, by depth charges from the Canadian frigate HMCS Saint John. 47 dead (all hands lost).

Loss position

See the 1 ships hit by U-309 - View the 9 war patrols

Boat has been discovered
The wreck of this boat has almost certainly been discovered in early 2001 off the east coast of Scotland. See photos from that wreck at

This boat is a dive site

July 2001. 63 metres to the seabed, 60 metres on the wreck. Dive team: John Thornton, Stuart Murray, Ian Huntington, Tim Hayes, Wolfgang Kanig. The team were diving a mixture of open circuit and closed circuit trimix

(this is not fully confirmed but very likely U-309)

Depth: 200 feet (61 meters)
Position (lat, long): 58.09, -2.23

See more U-boat dive sites.

Wolfpack operations

U-309 operated with the following Wolfpacks during its career:
   Rossbach (6 Oct 1943 - 9 Oct 1943)
   Schlieffen (14 Oct 1943 - 22 Oct 1943)
   Siegfried (22 Oct 1943 - 26 Oct 1943)
   Rügen 7 (28 Dec 1943 - 2 Jan 1944)
   Rügen 6 (2 Jan 1944 - 7 Jan 1944)
   Rügen (7 Jan 1944 - 26 Jan 1944)
   Stürmer (26 Jan 1944 - 3 Feb 1944)

Schnorchel-fitted U-boat

This boat was fitted with a Schnorchel underwater-breathing apparatus in April 1944.

Read more about the Schnorchel and see list of fitted boats.

Annoucements related to this boat

U-309 found by divers? (6 Jul 2001)

Men lost from the boat

30 Sep 1943
A man was lost in the North Atlantic while working on deck. [Mechanikergefreiter Erich Jungmann]

  Related: For more info on such losses see - Men lost from U-boats -

U-boat Emblems

We have 1 emblem entry for this boat. See the emblem page for this boat or view emblems individually below.

Bird on Pole

Media links

The Saint and The Sparrow, The Sinking of U-309

Skinner, Richard W.

German U-Boat Losses During World War II

Niestle, Axel

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

Wynn, Kenneth

Hitler's U-boat War, Vol II

Blair, Clay

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