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| U-984 | Type VIIC |
| Feldpost Number | M 53 784 |
| Construction Yard | Blohm und Voß, Hamburg |
| Yard Number | 184 |
| Ordered | 25th May 1941 |
| Keel laid | 7th Sep 1942 |
| Launched | 12th May 1943 |
| Commissioned | 17th Jun 1943 |
| Baubelehrung | 8.KLA, Hamburg | | Training, Flotillas and Duties | | 06.43 - 12.43 | 5.U-Flottille, Kiel
Ausbildungsboot (under training)
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| 01.44 - 08.44 | 9.U-Flottille, Brest
Frontboot (operational)
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| Commanders | | 06.43 - 08.44 | OL Heinz Sieder |
| Operations information for U-984 | 30.12.1943 - 02.01.1944
First Sailing
U-984 left Kiel under the command of Heinz Sieder on 30th Dec 1943 and arrived at Egersund on 2nd Jan 1944 after three days.
| 04.01.1944 - 24.02.1944
Second Sailing - active patrol
On the 4th Jan 1944, U-984 left Egersund under the command of Heinz Sieder and after over seven weeks arrived at Brest on 24th Feb 1944.
| 22.05.1944 - 27.05.1944
Third Sailing - active patrol
U-984 departed under Heinz Sieder from Brest on 22nd May 1944 and arrived back at Brest on 27th May 1944 after five days on patrol.
| 06.06.1944 - 10.06.1944
Fourth Sailing
U-984 left Brest under the command of Heinz Sieder on 6th Jun 1944 and returned four days later to Brest on 10th Jun 1944.
| 12.06.1944 - 19.06.1944
Fifth Sailing
On the 12th Jun 1944, U-984 left Brest under the command of Heinz Sieder and arrived at St. Peter Port on 19th Jun 1944 after one week.
| 21.06.1944 - 05.07.1944
Sixth Sailing - active patrol
U-984 departed under Heinz Sieder from St. Peter Port on 21st Jun 1944 and after two weeks arrived at Brest on 5th Jul 1944.
Heinz Sieder hit five ships on this patrol, four of these ships were in convoy, all of them from convoy EMC-17.-
On 25th Jun 1944 he fatally damaged the British 1,300 ton HMS Goodson.
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On 29th Jun 1944 he fatally damaged the American 7,176 ton HG Blasdel, sailing with convoy EMC-17.
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On 29th Jun 1944 he fatally damaged the American 7,176 ton James A Farrell, a member of convoy EMC-17.
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On 29th Jun 1944 he fatally damaged the American 7,198 ton John A Treutlen, part of convoy EMC-17.
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On 29th Jun 1944 he damaged the American 7,240 ton Edward M House, from convoy EMC-17.
| 26.07.1944 - 20.08.1944
Seventh Sailing - active patrol
U-984 left Brest under the command of Heinz Sieder on 26th Jul 1944. U-984 was lost on 20th Aug 1944.
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