Nummer: 01815
| Area : | Western Area |
| Sea area : | Gulf of Biscaya |
| Date of attack : | 01.06.1940 |
| Time of attack : | 22:25 |
| Nationality of U-boat : | German |
| U-boat : | U 37 |
| Commander : | Oehrn |
| Grid : | BE 9991 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 1100 BRT |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Torpedo(es) + Gunfire |
| Date of observation : | 01.06.1940 |
| Nationality of target : | Greek |
| Actual type of target : | Steam Freighter |
| Name of target : | Ioanna |
| Year of launch : | 1907 |
| Actual tonnage : | 950 BRT |
| Actual result : | sunk |
| Position of target : | 120sm W Cape Finisterre |
| Footnote : | The entry "BF 9991" in the torpedo report must be a typo. |
| updated on: | 18.06.2013 |
| Remark: | 1TA |