English
| U-557 | Type VIIC |
| Feldpost Number | M 37 961 |
| Construction Yard | Blohm und Voß, Hamburg |
| Yard Number | 533 |
| Ordered | 25th Sep 1939 |
| Keel laid | 6th Jan 1940 |
| Launched | 22nd Dec 1940 |
| Commissioned | 13th Feb 1941 |
| Baubelehrung | Baubelehrung U-Boote Nordsee, Bremen |
| Training, Flotillas and Duties | |
| 02.41 – 11.41 | 1.U-Flottille, Kiel & Brest Ausbildungsboot (under training) Frontboot (operational) |
| 12.41 – 12.41 | 29.U-Flottille, La Spezia Frontboot (operational) |
| Commanders | |
| 13.02.41 – 16.12.41 | KL Ottokar Paulshen see also: U-20 |
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