Nummer: 09520
| Area : | Western Area |
| Sea area : | US East Coast |
| Date of attack : | 14.05.1942 |
| Time of attack : | 07:17 |
| Nationality of U-boat : | German |
| U-boat : | U 564 |
| Commander : | Suhren |
| Grid : | DM 2643 |
| presumed target type : | Tanker |
| presumed tonnage : | 5000 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Date of observation : | 14.05.1942 |
| Time of observation : | 06:20 |
| Nationality of target : | Mexican |
| Actual type of target : | Steam Tanker |
| Name of target : | Potrero del Llano |
| Year of launch : | 1912 |
| Actual tonnage : | 4000 BRT |
| Actual result : | sunk |
| Position of target : | 25.35n 80.06w |
Steam Tanker Potrero del Llano ex Italian Lucifero (bis 1941)