Nummer: 04001
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 20.12.1940 |
| Time of attack : | 10:00 |
| Nationality of U-boat : | Italian |
| U-boat : | CALVI |
| Commander : | Caridi |
| Grid : | 54.40n 18.53w |
| presumed target type : | Steam Freighter id |
| presumed tonnage : | 5000 BRT |
| presumed result : | sunk |
| Number of torpedoes/mines : | 4 |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | OB.260 d |
| Date of observation : | 20.12.1940 |
| Nationality of target : | British |
| Actual type of target : | Steam Freighter |
| Name of target : | Carlton |
| Year of launch : | 1924 |
| Actual tonnage : | 5162 BRT |
| Actual result : | sunk |
| Position of target : | 54.30n 18.30w |
| Convoy : | OB.260 d |
| Route of convoy : | Liverpool - North America (out) |
| Remark to convoy : | Sep 1939 to Jul 1940 via South Ireland, Jul to Okt 1940 via North Cannel, then ON. |