Nummer: 21713
| Area : | Baltic Sea |
| Sea area : | Gulf of Finland |
| Date of attack : | 28.11.1944 |
| Nationality of U-boat : | German |
| U-boat : | U 481 |
| Commander : | Andersen |
| Grid : | AO 3548 |
| presumed target type : | Fleet Minelayer |
| presumed tonnage : | 640 ts |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Nationality of target : | Finnish |
| Actual type of target : | Fleet Minelayer |
| Name of target : | Riihlahti-Class |
| Actual tonnage : | 640 ts |
| Actual result : | hit not ascertained |
| Footnote : | On Nov.28th U-481 was reporting one gnat hit and at 12.26 h one misser on a Finnish minelayer, which sank in one hour. - Minelayer "Louhi" was not reported missing before Jan.12th, 1945. |
| updated on: | 21.02.2013 |