Nummer: 18911
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 23.01.1945 |
| Nationality of U-boat : | German |
| U-boat : | U 1172 |
| Commander : | Kuhlmann |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | MH.1 |
| Date of observation : | 23.01.1945 |
| Time of observation : | 16:45 |
| Nationality of target : | Norwegian |
| Actual type of target : | Steam Freighter |
| Name of target : | Vigsnes |
| Year of launch : | 1930 |
| Actual tonnage : | 1599 BRT |
| Actual result : | sunk |
| Position of target : | 53.33n 04.17w |
| Convoy : | MH.1 |
| Route of convoy : | Milford Haven - Holyhead |
| Remark to convoy : | Since Januar 1945 |