Nummer: 21013
| Area : | Arctic Ocean |
| Sea area : | North Norway |
| Date of attack : | 20.12.1944 |
| Time of attack : | 23:02 |
| Nationality of U-boat : | German |
| U-boat : | U 997 |
| Commander : | Lehmann |
| Grid : | AC 8578 |
| presumed target type : | Armed Trawler |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Footnote : | U-997 reported one auxiliary patrol craft sunk. |
| updated on: | 00.00.0000 |
| Remark: | 1999-02-20 Cloots |