Nummer: 20705
| Area : | Arctic Ocean |
| Date of attack : | 30.04.1944 |
| Time of attack : | 22:06 |
| Nationality of U-boat : | German |
| U-boat : | U 711 |
| Commander : | Lange |
| Grid : | AB 6346 |
| presumed target type : | Destroyer |
| presumed tonnage : | 1600 ts |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Convoy : | RA.59 |
| Footnote : | U-711 observed after a run-time of 4:03 min a gnat hit on a destroyer of the Groznyj-class, and after 5:07 min a FAT-hit on a Liberty-ship. One additional gnat detonation was heard after 6:15 min. U-387 probably attacked the same Groznyj-class destroyer. Soviet destroyers of this class were often misidentified as British ships of the Black Swan-class. |
| Convoy : | RA.59 |
| Route of convoy : | Kola Fjord - Iceland - Loch Ewe |
| Remark to convoy : | Since Dec 1942, former QP (counter traffic = JW) |