| Born | 3 May, 1915 | Hamburg |
| Died | 7 Oct, 1994 |
|
Ranks
Decorations |
U-boat Commands
| U-46 | Oct, 1941 | - | 19 Nov, 1941 | No war patrols |
| U-601 | 18 Dec, 1941 | - | 28 Nov, 1943 | 7 patrols (191 days) |
| U-872 | 10 Feb, 1944 | - | 29 Jul, 1944 | No war patrols |
| U-3015 | 17 Dec, 1944 | - | 5 May, 1945 | No war patrols |
Patrol info
| U-boat | Departure | Arrival | |||||
| 1. | U-601 | 4 Jul, 1942 | Kiel | 10 Jul, 1942 | Narvik | 7 days | |
| 2. | U-601 | 14 Jul, 1942 | Narvik | 3 Aug, 1942 | Kirkenes | Patrol, | 21 days |
| 3. | U-601 | 9 Aug, 1942 | Kirkenes | 20 Sep, 1942 | Neidenfjord | Patrol, | 43 days |
| 4. | U-601 | 22 Sep, 1942 | Neidenfjord | 24 Sep, 1942 | Bergen | 3 days | |
| 5. | U-601 | 31 Oct, 1942 | Bergen | 3 Nov, 1942 | Narvik | 4 days | |
| 6. | U-601 | 5 Nov, 1942 | Narvik | 7 Dec, 1942 | Harstad | Patrol, | 33 days |
| 7. | U-601 | 8 Dec, 1942 | Harstad | 8 Dec, 1942 | Narvik | 1 days | |
| 8. | U-601 | 15 Dec, 1942 | Narvik | 24 Dec, 1942 | Kiel | 10 days | |
| 9. | U-601 | 3 Apr, 1943 | Kiel | 5 Apr, 1943 | Kristiansand | 3 days | |
| 10. | U-601 | 6 Apr, 1943 | Kristiansand | 7 Apr, 1943 | Bergen | 2 days | |
| 11. | U-601 | 15 Apr, 1943 | Bergen | 14 May, 1943 | Bergen | Patrol, | 30 days |
| 12. | U-601 | 15 May, 1943 | Harstad | 15 May, 1943 | Narvik | 1 days | |
| 13. | U-601 | 7 Jul, 1943 | Narvik | 10 Jul, 1943 | Narvik | 4 days | |
| 14. | U-601 | 14 Jul, 1943 | Narvik | 25 Jul, 1943 | Hammerfest | Patrol, | 12 days |
| 15. | U-601 | 26 Jul, 1943 | Hammerfest | 27 Jul, 1943 | Tromsö | 2 days | |
| 16. | U-601 | 29 Jul, 1943 | Tromsö | 29 Jul, 1943 | Hammerfest | 1 days | |
| 17. | U-601 | 30 Jul, 1943 | Hammerfest | 28 Aug, 1943 | Narvik | Patrol, | 30 days |
| 18. | U-601 | 13 Sep, 1943 | Narvik | 14 Sep, 1943 | Tromsö | 2 days | |
| 19. | U-601 | 15 Sep, 1943 | Tromsö | 16 Sep, 1943 | Hammerfest | 2 days | |
| 20. | U-601 | 16 Sep, 1943 | Hammerfest | 7 Oct, 1943 | Hammerfest | Patrol, | 22 days |
| 21. | U-601 | 8 Oct, 1943 | Hammerfest | 8 Oct, 1943 | Tromsö | 1 days | |
| 22. | U-601 | 9 Oct, 1943 | Tromsö | 9 Oct, 1943 | Harstad | 1 days | |
| 23. | U-601 | 10 Oct, 1943 | Harstad | 10 Oct, 1943 | Skjomenfjord | 1 days | |
| 24. | U-601 | 12 Oct, 1943 | Skjomenfjord | 14 Oct, 1943 | Trondheim | 3 days | |
| 25. | U-601 | 17 Oct, 1943 | Trondheim | 19 Oct, 1943 | Bergen | 3 days | |
| 7 patrols, 191 days at sea | |||||||
Ships hit by Peter-Ottmar Grau
| Date | Boat | Name of ship | Tons | Nat. | Convoy | Fate * | |
| 1 Aug, 1942 | U-601 | Krest´janin | 2.513 | | sj | ||
| 24 Aug, 1942 | U-601 | Kujbyshev | 2.332 | | sj | ||
| 23 Nov, 1942 | U-601 | Kusnec Lesov | 3.974 | | sj | QP-15 | |
| 8.819 | |||||||
* Unless otherwise noted the ships listed here were sunk. | |||||||
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Decorations and ranks information is in many cases not complete. If you can help on any of those missing that would be great.

