Nummer: 27903
| Area : | Pacific Ocean |
| Sea area : | South Pacific |
| Date of attack : | 05.05.1942 |
| Nationality of U-boat : | Japanese |
| U-boat : | I-21 |
| Commander : | Matsumura |
| presumed target type : | Steam Freighter |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Date of observation : | 05.05.1942 |
| Time of observation : | 23:05 |
| Nationality of target : | American |
| Actual type of target : | Steam Freighter |
| Name of target : | John Adams |
| Year of launch : | 1942 |
| Actual tonnage : | 7180 BRT |
| Actual result : | sunk |
| Position of target : | 22.30s 164.35e |