Nummer: 25902
| Area : | Indic Ocean |
| Date of attack : | 21.01.1942 |
| Time of attack : | 08:25 |
| Nationality of U-boat : | Japanese |
| U-boat : | I-166 |
| Commander : | Yoshitome |
| Grid : | off Rangoon |
| presumed target type : | Steam Freighter id |
| presumed tonnage : | 4000 BRT |
| presumed result : | sunk |
| Number of torpedoes/mines : | 1 |
| Used weapon(s) : | Torpedo(es) + Gunfire |
| Date of observation : | 22.01.1942 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Chak Sang |
| Year of launch : | 1917 |
| Actual tonnage : | 2358 BRT |
| Actual result : | sunk |
| Position of target : | 15.42n 95.02e |
| updated on: | 00.00.0000 |
| Remark: | 15363 |