Nummer: 27412
| Area : | Indic Ocean |
| Date of attack : | 21.03.1944 |
| Nationality of U-boat : | Japanese |
| U-boat : | I-26 |
| Commander : | Kusaka |
| presumed target type : | Steam Freighter |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) + Gunfire |
| Date of observation : | 21.03.1944 |
| Time of observation : | 09:09 |
| Nationality of target : | Norwegian |
| Actual type of target : | Motor Tanker |
| Name of target : | Grena |
| Year of launch : | 1934 |
| Actual tonnage : | 8117 BRT |
| Actual result : | sunk |
| Position of target : | 20.48n 59.38e |