Nummer: 21017a
| Area : | Arctic Ocean |
| Sea area : | North Norway |
| Date of attack : | 30.12.1944 |
| Time of attack : | 17:25 |
| Nationality of U-boat : | German |
| U-boat : | U 956 |
| Commander : | Mohs |
| Grid : | AC 8812 |
| presumed target type : | Steam Freighter |
| presumed tonnage : | 5000 BRT |
| presumed result : | sunk |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | KP.24 |
| Date of observation : | 30.12.1944 |
| Nationality of target : | Soviet |
| Actual type of target : | Steam Freighter |
| Name of target : | Tbilisi² |
| Year of launch : | 1942 |
| Actual tonnage : | 7176 BRT |
| Actual result : | not repaired, total loss |
| Position of target : | 69.56n 32.29e |
| Footnote : | U-956 reported one ship sunk, one probably sunk. "Tbilisi²"was towed into Kildin and beached. She was not repaired during the war. |
| related attacks : | Angriff 1 |
Steam Freighter Tbilisi² ex American John Langdon (bis 1941)
| Convoy : | KP.24 |
| Route of convoy : | Kola Fjord - Petsamo / Kirkenes (soviet) |
| Remark to convoy : | Since Nov 1944 |