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| U-921 | Type VIIC |
| Feldpost Number | M 50 627 |
| Construction Yard | Neptun Schiffswerft und Maschinenfabrik AG, Rostock |
| Yard Number | 508 |
| Ordered | 6th Jun 1941 |
| Keel laid | 15th Oct 1941 |
| Launched | 3rd Apr 1943 |
| Commissioned | 30th May 1943 |
| Baubelehrung | 5.KLA, Rostock | | Training, Flotillas and Duties | | 05.43 - 05.44 | 8.U-Flottille, Danzig Ausbildungsboot (under training)
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| 06.44 - 09.44 | 13.U-Flottille, Trondheim Frontboot (operational)
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| Commanders | | 05.43 - 05.44 | OL Wolfgang Leu |
| 05.44 - 05.44 | LT Hans Neumann |
| 06.44 - 09.44 | OL Alfred Werner see also: U-8 |
| Operations information for U-921 | 18.05.1944 - 26.05.1944 First Sailing - active patrol
U-921 left Kiel under the command of Wolfgang Leu on 18th May 1944 and arrived at Trondheim on 26th May 1944 after just over one week.
| 30.06.1944 - 01.07.1944 Second Sailing
On the 30th Jun 1944, U-921 left Trondheim under the command of Alfred Werner and after one day arrived at Narvik on 1st Jul 1944.
| 02.07.1944 - 07.08.1944 Third Sailing - active patrol
U-921 departed under Alfred Werner from Narvik on 2nd Jul 1944 and arrived at Hammerfest on 7th Aug 1944 after just over five weeks.
| 08.08.1944 - 09.08.1944 Fourth Sailing
U-921 left Hammerfest under the command of Alfred Werner on 8th Aug 1944 and after one day arrived at Narvik on 9th Aug 1944.
| 02.09.1944 - 03.09.1944 Fifth Sailing
On the 2nd Sep 1944, U-921 left Narvik under the command of Alfred Werner and arrived back at Narvik one day later on 3rd Sep 1944.
| 05.09.1944 - 02.10.1944 Sixth Sailing - active patrol
U-921 departed under Alfred Werner from Narvik on 5th Sep 1944. The boat was declared missing after 2nd Oct 1944.
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