Nummer: 29102
| Area : | Pacific Ocean |
| Sea area : | Southeast Asia |
| Date of attack : | 24.07.1945 |
| Time of attack : | 15:00 |
| Nationality of U-boat : | Japanese |
| U-boat : | I-53 |
| Commander : | Oba / Katsuyama |
| Grid : | ENE Luzon |
| presumed target type : | Transport Cargo |
| presumed result : | sunk |
| Used weapon(s) : | "kaiten" = Human Torpedo |
| Convoy : | unknown |
| Date of observation : | 24.07.1945 |
| Time of observation : | nchm |
| Nationality of target : | American |
| Actual type of target : | Destroyer Escort |
| Name of target : | Underhill (DE.682) |
| Year of launch : | 1943 |
| Actual tonnage : | 1432 ts |
| Actual result : | sunk |
| Position of target : | 19.20n 126.42e |
| Footnote : | I-53 launched a kaitens piloted by Lt(jg) Katsuyama Jun against a convoy with USS Adria and six LST loaded with battle-weary troops of the 96th Infantry Division from Okinawa, and destroyer "Underhill" with five PC and two SC as escort. - "Underhill" rammed the kaiten, but the explosion damaged herself, so that she broke in two and had to be scuttled by gunfire. |
| Convoy : | unknown |
| updated on: | 00.00.0000 |
| Remark: | Katsuyama (Jun) |
| Changes: | ADRIA (AF.30), 5 LST (96th Infantry Division) / escorted by UNDERHILL (DE.682), PC.1251, 803, 804, 807, SC.1306, 1309, PCE.872. |