Nummer: 18021
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 17.05.1944 |
| Time of attack : | 13:10 |
| Nationality of U-boat : | German |
| U-boat : | U 736 |
| Commander : | Reff |
| Grid : | BE 5157 |
| presumed target type : | Steam Freighter |
| presumed result : | damaged |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Convoy : | unknown |
| Footnote : | U-736 reported a gnat detonation after 2:35 min. |
| Convoy : | unknown |