Nummer: 22406
| Area : | Mediterranean |
| Date of attack : | 08.10.1940 |
| Time of attack : | 01:21 |
| Nationality of U-boat : | Italian |
| U-boat : | TRICHECO |
| Commander : | Avogadro di Cerrione |
| Grid : | 35.30n 27.18e |
| presumed target type : | Submarine |
| presumed tonnage : | ts |
| presumed result : | sunk |
| Number of torpedoes/mines : | 2 |
| Used weapon(s) : | Torpedo(es) |
| Nationality of target : | Italian |
| Actual type of target : | Submarine |
| Name of target : | Gemma |
| Year of launch : | 1936 |
| Actual tonnage : | 695 ts |
| Actual result : | sunk |
| Position of target : | 35.30n 27.18e |
| Footnote : | "Tricheco" erroneously sank the Italian U-boat "Gemma". |