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| U-1021 | Type VIIC/41 |
| Feldpost Number | M 23 789 |
| Construction Yard | Blohm und Voß, Hamburg |
| Yard Number | 221 |
| Ordered | 13th Jun 1942 |
| Keel laid | 6th May 1943 |
| Launched | 13th Apr 1944 |
| Commissioned | 25th May 1944 |
| Baubelehrung | 8.KLA, Hamburg | | Training, Flotillas and Duties | | 05.44 - 11.44 | 31.U-Flottille, Hamburg Ausbildungsboot (under training)
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| 12.44 - 03.45 | 11.U-Flottille, Bergen Frontboot (operational)
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| Commanders | | 04.44 - 03.45 | OL William Holpert |
| Operations information for U-1021 | 04.02.1945 - 08.02.1945 First Sailing
U-1021 left Kiel under the command of William Holpert on 4th Feb 1945 and arrived at Horten on 8th Feb 1945 after four days.
| 10.02.1945 - 13.02.1945 Second Sailing
On the 10th Feb 1945, U-1021 left Horten under the command of William Holpert and after three days arrived at Bergen on 13th Feb 1945.
| 16.02.1945 - 19.02.1945 Third Sailing
U-1021 departed under William Holpert from Bergen on 16th Feb 1945 and arrived back at Bergen on 19th Feb 1945 after three days.
| 20.02.1945 - 30.03.1945 Fourth Sailing - active patrol
U-1021 left Bergen under the command of William Holpert on 20th Feb 1945. U-1021 was sunk on 30th Mar 1945.
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| | | We don't have extra information on any relevant ships here.
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