Nummer: 09017
| Area : | Western Area |
| Sea area : | Carribean Sea |
| Date of attack : | 17.04.1942 |
| Time of attack : | 05:23 |
| Nationality of U-boat : | German |
| U-boat : | U 66 |
| Commander : | Zapp |
| Grid : | ED 8617 |
| presumed target type : | Tanker id |
| presumed tonnage : | 11020 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Date of observation : | 17.04.1942 |
| Time of observation : | 03:36 |
| Nationality of target : | Panamanian |
| Actual type of target : | Motor Tanker |
| Name of target : | Heinrich von Riedemann |
| Year of launch : | 1930 |
| Actual tonnage : | 11020 BRT |
| Actual result : | sunk |
| Position of target : | 11.55n 63.47w |
