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| U-646 | Type VIIC |
| Feldpost Number | M 49 751 |
| Construction Yard | Blohm und Voß, Hamburg |
| Yard Number | 622 |
| Ordered | 20th Jan 1941 |
| Keel laid | 23rd Dec 1941 |
| Launched | 3rd Sep 1942 |
| Commissioned | 29th Oct 1942 |
| Baubelehrung | 8.KLA, Hamburg | | Training, Flotillas and Duties | | 10.42 - 03.43 | 5.U-Flottille, Kiel Ausbildungsboot (under training)
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| 04.43 - 05.43 | 11.U-Flottille, Bergen Frontboot (operational)
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| Commanders | | 10.42 - 05.43 | LT Heinrich Wulff |
| Operations information for U-646 | 23.03.1943 - 24.03.1943 First Sailing
U-646 left Kiel under the command of Heinrich Wulff on 23rd Mar 1943 and arrived at return on 24th Mar 1943 after one day.
| 25.03.1943 - 25.03.1943 Second Sailing
On the 25th Mar 1943, U-646 left Kristiansand under the command of Heinrich Wulff and arrived at return on the same day.
| 26.03.1943 - 26.03.1943 Third Sailing
U-646 departed under Heinrich Wulff from Stavanger on 26th Mar 1943 and arrived at return on the same day.
| 28.03.1943 - 30.04.1943 Fourth Sailing - active patrol
U-646 left Bergen under the command of Heinrich Wulff on 28th Mar 1943 and after more than four weeks arrived at return on 30th Apr 1943.
| 12.05.1943 - 17.05.1943 Fifth Sailing
On the 12th May 1943, U-646 left Trondheim under the command of Heinrich Wulff and arrived at return on 17th May 1943 after five days. At 1709 HRS on 17th May 1943 in square AE 85, U-646 came under attack from an aircraft of RAF 269 Squadron. U-646 was moderately damaged by the attack. At 2307 HRS on 17th May 1943 in square AE 85, U-646 came under attack from an aircraft of RAF 269 Squadron. U-646 was destroyed in the attack.
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| | | We don't have extra information on any relevant ships here.
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