English
| U-621 | Type VIIC |
| Feldpost Number | M 02 062 |
| Construction Yard | Blohm und Voß, Hamburg |
| Yard Number | 597 |
| Ordered | 15th Aug 1940 |
| Keel laid | 1st Jul 1941 |
| Launched | 19th Mar 1942 |
| Commissioned | 7th May 1942 |
| Baubelehrung | Kriegsschiffbaulehrabteilung für Unterseeboote Nordsee, Bremen / 8.KLA, Hamburg |
| Training, Flotillas and Duties | |
| 05.42 – 09.42 | 8.U-Flottille, Danzig Ausbildungsboot (under training) |
| 10.42 – 08.44 | 9.U-Flottille, Brest Frontboot (operational) |
| Commanders | |
| 05.42 – 12.42 | KL Horst Schünemann see also: U-62 |
| 12.42 – 05.44 | OL Max Kruschka |
| 05.44 – 08.44 | OL Hermann Stuckmann see also: U-316 |
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