Nummer: 28815
| Area : | Pacific Ocean |
| Sea area : | Southeast Asia |
| Date of attack : | 25.01.1945 |
| Nationality of U-boat : | Japanese |
| U-boat : | Ha-81 |
| Commander : | Sasakawa (Tsutomu) |
| Grid : | off Cebu |
| presumed target type : | |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | unknown |
| Actual result : | hit not ascertained |
| Position of target : | SW Negros |
| Convoy : | unknown |
| updated on: | 00.00.0000 |
| Remark: | seaplane carrier |