Nummer: 21410
| Area : | Baltic Sea |
| Sea area : | Gulf of Finland |
| Date of attack : | 30.06.1941 |
| Time of attack : | 22:56 |
| Nationality of U-boat : | Finnish |
| U-boat : | IKU TURSO |
| Commander : | Pekkanen |
| Grid : | SW Stenskär |
| presumed target type : | Submarine |
| presumed result : | target visibly missed |
| Used weapon(s) : | Torpedo(es) |
| Nationality of target : | Soviet |
| Actual type of target : | Submarine |
| Name of target : | K-3 |
| Year of launch : | 1938 |
| Actual tonnage : | 1480 ts |
| Actual result : | hit not ascertained |
| Position of target : | [10sm SW Stenskär] |
| updated on: | 10.08.2010 |
| Remark: | K-3 |