Nummer: 20205
| Area : | Arctic Ocean |
| Date of attack : | 03.02.1943 |
| Time of attack : | 14:12 |
| Nationality of U-boat : | German |
| U-boat : | U 255 |
| Commander : | Reche |
| Grid : | AB 7552 |
| presumed target type : | Steam Freighter id |
| presumed tonnage : | 7460 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | RA.52 |
| Date of observation : | 03.02.1943 |
| Time of observation : | 14:00 |
| Nationality of target : | American |
| Actual type of target : | Steam Freighter |
| Name of target : | Greylock |
| Year of launch : | 1921 |
| Actual tonnage : | 7460 BRT |
| Actual result : | sunk |
| Position of target : | 70.52n 00.21w |
| Footnote : | U-255 observed two hits on one ship after a run-time of 1:50 min, and heard one additional detonation after 3:20 min. |
| Convoy : | RA.52 |
| Route of convoy : | Kola Fjord - Iceland - Loch Ewe |
| Remark to convoy : | Since Dec 1942, former QP (counter traffic = JW) |