Nummer: 13616d
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 15.11.1942 |
| Time of attack : | 22:41 |
| Nationality of U-boat : | German |
| U-boat : | U 521 |
| Commander : | Bargsten |
| Grid : | AK 6215 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 5000 BRT |
| presumed result : | damaged |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | ONS.144 |
| Footnote : | U-521 heard after two 2-torpedo spreads two double detonations after 10:55 min and 10:38 min. The torpedoes detonated in the convoy. Two detonations from stern shots reported after 7:31 min were in reality depth charges from HMS "Rose". |
| Convoy : | ONS.144 |
| Route of convoy : | United Kingdom - North America |
| Remark to convoy : | 1st series: Jul 1941 to Mar 1943 ON and ONS combined, later ON mit continuing and ONS with new numbering (counter traffic HX and SC) |