Nummer: 11701a
| Area : | Western Area |
| Sea area : | Carribean Sea |
| Date of attack : | 18.08.1942 |
| Time of attack : | 05:59 |
| Nationality of U-boat : | German |
| U-boat : | U 553 |
| Commander : | Thurmann |
| Grid : | DN 7472 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 5000 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | TAW.13 |
| Date of observation : | 18.09.1942 |
| Time of observation : | 04:05 |
| Nationality of target : | Swedish |
| Actual type of target : | Motor Freighter |
| Name of target : | Blankaholm |
| Year of launch : | 1930 |
| Actual tonnage : | 2845 BRT |
| Actual result : | sunk |
| Position of target : | 19.35n 76.25w |
| Footnote : | In a first attack series U-553 fired two 2-torpedo spreads and one stern shot. - With the first 2-torpedo-spread two ships were observed sinking, but only one ship, the "Blankaholm", was really sunk during the first run. |
| related attacks : | Angriff 1 Angriff 2 Angriff 3 |
| Convoy : | TAW.13 |
| Route of convoy : | Trinidad - Aruba - Key West |
| Remark to convoy : | Jul to Aug 1942, then TAG. Counter traffic = WAT |
| updated on: | 05.05.2019 |
| Remark: | SCHIFF, ZEIT2 |
| Changes: | 1) Rohwer 1968 hatte hier BLANKAHOLM + um 04h05 2) Rohwer 1995 verschob BLANKAHOLM + auf Angriff 09.13 3) War Diary Admirality: .. BLANKAHOLM + um 04h05 |