Nummer: 17912
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 20.03.1944 |
| Time of attack : | 23:28 |
| Nationality of U-boat : | German |
| U-boat : | U 621 |
| Commander : | Kruschka |
| Grid : | AM 3469 |
| presumed target type : | Destroyer |
| presumed result : | sunk |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Actual tonnage : | ---- -- |
| Actual result : | hit not ascertained |
| Footnote : | U-621 reported a gnat end-of-run detonation after 10:45 min. |