English
| U-657 | Type VIIC |
| Feldpost Number | M 38 963 |
| Construction Yard | Howaldtswerke AG, Hamburg |
| Yard Number | 806 |
| Ordered | 9th Oct 1939 |
| Keel laid | 5th Oct 1940 |
| Launched | 12th Aug 1941 |
| Commissioned | 8th Oct 1941 |
| Baubelehrung | Baubelehrung U-Boote Nordsee, Bremen / Kriegsschiffbaulehrabteilung für Unterseeboote Nordsee, Bremen / 8.KLA, Hamburg |
| Training, Flotillas and Duties | |
| 10.41 – 02.42 | 8.U-Flottille, Königsberg Ausbildungsboot (under training) |
| 03.42 – 06.42 | 3.U-Flottille, La Pallice Frontboot (operational) |
| 07.42 – 05.43 | 11.U-Flottille, Bergen Frontboot (operational) |
| Commanders | |
| 10.41 – 12.41 | OL Hans-Jürgen Radke see also: U-148 |
| 12.41 – 05.43 | OL Heinrich Göllnitz |
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