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| U-821 | Type VIIC |
| Feldpost Number | M 52 715 |
| Construction Yard | Stettiner Oderwerke A.G., Stettin |
| Yard Number | 821 |
| Ordered | 20th Jan 1941 |
| Keel laid | 2nd Oct 1941 |
| Launched | 26th Jun 1943 |
| Commissioned | 11th Oct 1943 |
| Baubelehrung | 5.KLA, Rostock | | Training, Flotillas and Duties | | 10.43 - 11.43 | 4.U-Flottille, Stettin Ausbildungsboot (under training)
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| 11.43 - 12.43 | 24.U-Flottille, Memel Ausbildungsboot (under training)
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| 01.44 - 03.44 | 4.U-Flottille, Stettin Ausbildungsboot (under training)
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| 03.44 - 06.44 | 1.U-Flottille, Brest Frontboot (operational)
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| Commanders | | 10.43 - 12.43 | LT ~ OL Ludwig Fabricius see also: U-30 U-721 |
| 12.43 - 12.43 | OL Ernst Fischer see also: U-30 U-749 U-3006 |
| 01.44 - 06.44 | OL Ulrich Knackfuss see also: U-345 |
| Operations information for U-821 | 07.03.1944 - 09.03.1944 First Sailing
U-821 left Kiel under the command of Ulrich Knackfuß on 7th Mar 1944 and arrived at Kristiansand on 9th Mar 1944 after two days.
| 17.03.1944 - 18.03.1944 Second Sailing
On the 17th Mar 1944, U-821 left Kristiansand under the command of Ulrich Knackfuß and after one day arrived at Bergen on 18th Mar 1944.
| 19.03.1944 - 12.04.1944 Third Sailing - active patrol
U-821 departed under Ulrich Knackfuß from Bergen on 19th Mar 1944 and arrived at Brest on 12th Apr 1944 after three and a half weeks.
| 06.06.1944 - 10.06.1944 Fourth Sailing - active patrol
U-821 left Brest under the command of Ulrich Knackfuß on 6th Jun 1944. U-821 was sunk on 10th Jun 1944.
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