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| U-677 | Type VIIC |
| Feldpost Number | M 52 352 |
| Construction Yard | Howaldtswerke AG, Hamburg |
| Yard Number | 826 |
| Ordered | 5th Jun 1941 |
| Keel laid | 13th Jun 1942 |
| Launched | 6th Jul 1943 |
| Commissioned | 20th Sep 1943 |
| Baubelehrung | 8.KLA, Hamburg | | Training, Flotillas and Duties | | 09.43 - 05.44 | 5.U-Flottille, Kiel Ausbildungsboot (under training)
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| 06.44 - 07.44 | 3.U-Flottille, La Pallice Frontboot (operational)
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| 07.44 - 02.45 | 23.U-Flottille, Danzig Schulboot (training boat)
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| 02.45 - 04.45 | 31.U-Flottille, Hamburg Ausbildungsboot (under training)
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| Commanders | | 09.43 - 07.44 | OL Paul Weber see also: U-3001 U-3022 |
| 07.44 - 04.45 | LT Gerhard Ady see also: U-704 |
| Operations information for U-677 | 27.05.1944 - 29.05.1944 First Sailing
U-677 left Kiel under the command of Paul Weber on 27th May 1944 and arrived at Marviken on 29th May 1944 after two days.
| 08.06.1944 - 29.06.1944 Second Sailing - active patrol
On the 8th Jun 1944, U-677 left Marviken under the command of Paul Weber and after three weeks arrived at Bergen on 29th Jun 1944.
| 01.07.1944 - 02.07.1944 Third Sailing
U-677 departed under Paul Weber from Bergen on 1st Jul 1944 and arrived at Stavanger on 2nd Jul 1944 after one day.
| 04.07.1944 - 04.07.1944 Fourth Sailing
U-677 left Stavanger under the command of Paul Weber on 4th Jul 1944 and arrived at Kristiansand on the same day.
| 04.07.1944 - 06.07.1944 Fifth Sailing
On the 4th Jul 1944, U-677 left Kristiansand under the command of Paul Weber and arrived at Kiel on 6th Jul 1944 after two days.
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