Nummer: 21001
| Area : | Arctic Ocean |
| Sea area : | North Norway |
| Date of attack : | 04.12.1944 |
| Time of attack : | 23:42 |
| Nationality of U-boat : | German |
| U-boat : | U 997 |
| Commander : | Lehmann |
| Grid : | AW 2220 |
| presumed target type : | Patrol Craft |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Convoy : | unknown |
| Footnote : | BO-230 ex SC-1477 was sunk on Dec.5th by U-365, while operating in a subchaser task force together with BO-219, BO-223 and BO-229. - BO-229 ex SC-1485 was sunk on Dec.7th by U-997, while operating in a subchaser task force together with BO-150, BO-227 and BO-228. |
| Convoy : | unknown |
| updated on: | 00.00.0000 |
| Remark: | Anmerkung |