Nummer: 26301
| Area : | Indic Ocean |
| Date of attack : | 08.07.1942 |
| Time of attack : | 07:48 |
| Nationality of U-boat : | Japanese |
| U-boat : | I-10 |
| Commander : | Kayahara |
| presumed target type : | Steam Freighter |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) + Gunfire |
| Date of observation : | 08.07.1942 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Hartismere |
| Year of launch : | 1933 |
| Actual tonnage : | 5498 BRT |
| Actual result : | sunk |
| Position of target : | 18.00s 41.22e |