Nummer: 20604
| Area : | Arctic Ocean |
| Date of attack : | 01.04.1944 |
| Time of attack : | 23:08 |
| Nationality of U-boat : | German |
| U-boat : | U 711 |
| Commander : | Lange |
| Grid : | AB 5637 |
| presumed target type : | Destroyer |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Convoy : | JW.58 |
| Footnote : | U-711 heard a gnat detonation after 2:06 min and a following explosion. |
| Convoy : | JW.58 |
| Route of convoy : | Loch Ewe - (Iceland) - Kola Fjord - (Arkhangelsk) |
| Remark to convoy : | Since Dec 1942, former PQ (counter traffic = RA) |